1874:
28:
487:
1936:
1239:
366:
1911:
1926:
983:
Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017). "General catalogue of variable stars: Version GCVS 5.1".
861:
Shulyak, D.; et al. (2008). "Model atmospheres of magnetic chemically peculiar stars. A remarkable strong-field Bp SiCrFe star HD 137509".
578:
and N. Houk noted the strength of hydrogen lines and weakness of helium are more typical of a class near B9. It shows a luminosity above the
1896:
925:
Bailey, J. D.; Landstreet, J. D. (2013). "Abundances determined using Si ii and Si iii in B-type stars: Evidence for stratification".
1268:
647:
149:
1921:
51:
1431:
623:
by L. O. Lodén and A. Sundman in 1989, and a variable spectrum was noted by H. Pedersen in 1979. It has one of the strongest
410:
1029:
Barbier-Brossat, M.; Petit, M.; Figon, P. (December 1994). "Third bibliographic catalogue of stellar radial velocities".
736:
547:
of 6.86 down to 6.93 with a period of 4.4916 days. The star is located at a distance of approximately 647
1931:
1906:
1543:
1451:
723:
544:
536:
464:
777:
628:
583:
1694:
624:
617:
591:
479:
475:
469:
113:
1117:"Interferometry of chemically peculiar stars: Theoretical predictions versus modern observing facilities"
1781:
1586:
1456:
667:
659:
374:
1440:
1379:
1332:
1298:
1196:
1138:
1084:
1038:
992:
944:
880:
822:
755:
696:
528:
236:
64:
532:
483:
1424:
1395:
1369:
1212:
1186:
1156:
1128:
1074:
1008:
960:
934:
896:
870:
838:
812:
745:
587:
257:
96:
33:
1901:
1475:
1264:
639:
508:
438:
47:
1360:
Kochukhov, O. (July 2006). "Remarkable non-dipolar magnetic field of the Bp star HD 137509".
687:
Lanz, T.; Mathys, G. (August 1991). "The
Photometric Variability of the B9p Star HD 137509".
1387:
1383:
1340:
1302:
1204:
1146:
1092:
1042:
1000:
952:
948:
888:
884:
830:
765:
760:
607:
571:
556:
396:
341:
220:
1857:
1753:
1229:
651:
643:
560:
354:
168:
72:
655:
1336:
1200:
1142:
1088:
996:
826:
700:
1503:
1263:. Vol. 2. Sky Publishing Corporation and the European Space Agency. p. 1009.
603:
456:
228:
208:
196:
1177:
Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars",
1916:
1890:
1877:
1533:
1528:
1417:
1216:
1063:"An investigation of the rotational properties of magnetic chemically peculiar stars"
1012:
842:
620:
579:
524:
185:
144:
59:
1399:
1160:
964:
900:
1770:
1518:
1498:
1493:
1483:
321:
287:
956:
770:
727:
586:. The stellar atmosphere appears deficient in helium, but shows a rich variety of
27:
1391:
892:
1523:
1508:
1488:
1316:
663:
575:
128:
85:
36:
1513:
1208:
1004:
834:
803:
Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation".
548:
531:, positioned less than a degree from the northern constellation boundary with
334:
301:
243:
156:
1289:
Mathys, G.; Lanz, T. (July 1997). "The variations of the BP star HD 137509".
1831:
1737:
1732:
1727:
1722:
1717:
1712:
1707:
1702:
1684:
1679:
1674:
1669:
1664:
1659:
1649:
1644:
1639:
1634:
1629:
1624:
1619:
1614:
1609:
1604:
1599:
1594:
1576:
1566:
1151:
1116:
634:
1097:
1062:
1789:
1561:
1556:
1551:
1374:
445:
1409:
1805:
1654:
610:
567:
1849:
1823:
1234:
781:
590:. However, there are no lines of manganese or mercury, so it's not a
502:
388:
314:
248:
1345:
1320:
1191:
1079:
750:
1133:
939:
875:
817:
650:. The star is about 124 million years old with 3.4 times the
1466:
566:
In 1973, W. P. Bidelman and D. J. MacConnell found this to be a
520:
212:
200:
1413:
732:
Data
Release 2: Summary of the contents and survey properties"
552:
1024:
1022:
1321:"An interesting new southern peculiar A star - HD 137509"
920:
918:
916:
914:
912:
910:
543:, or NN Aps for short, and ranges in brightness from an
1325:
798:
796:
794:
792:
790:
570:
of the silicon type. During a reclassification of the
1110:
1108:
1056:
1054:
1052:
856:
854:
852:
613:
with overabundances of silicon, chromium, and iron.
1848:
1822:
1798:
1780:
1769:
1746:
1693:
1585:
1542:
1474:
1465:
1284:
1282:
1280:
1259:Sinnott, Roger W.; Perryman, Michael A. C. (1997).
39:
of HD 137509, adapted from Lanz & Mathys (1991)
978:
976:
974:
726:; et al. (Gaia collaboration) (August 2018).
1172:
1170:
1121:Monthly Notices of the Royal Astronomical Society
1067:Monthly Notices of the Royal Astronomical Society
646:to be precisely measured. It is classified as a
1425:
1240:Centre de données astronomiques de Strasbourg
90:−71° 03′ 43.6643″
8:
658:. On average it is radiating ~123 times the
1845:
1819:
1777:
1471:
1432:
1418:
1410:
1061:Netopil, Martin; et al. (July 2017).
1373:
1344:
1190:
1150:
1132:
1096:
1078:
938:
874:
816:
769:
759:
749:
718:
716:
714:
712:
710:
50:J2000
1937:Objects with variable star designations
679:
642:. Both variances of the star allow its
192:
689:Information Bulletin on Variable Stars
559:, and is drifting further away with a
18:
1031:Astronomy and Astrophysics Supplement
7:
204:
1912:Alpha2 Canum Venaticorum variables
14:
1115:Shulyak, D.; et al. (2014).
594:. HD 137509 is now classified as
1873:
1872:
648:Alpha Canum Venaticorum variable
26:
778:Gaia DR2 record for this source
227:5.0410 ± 0.0503
1927:Henry Draper Catalogue objects
16:Star in the constellation Apus
1:
927:Astronomy & Astrophysics
737:Astronomy & Astrophysics
957:10.1051/0004-6361/201220671
771:10.1051/0004-6361/201833051
574:of southern stars in 1975,
1953:
1897:B-type main-sequence stars
1392:10.1051/0004-6361:20064932
1362:Astronomy and Astrophysics
1319:; Houk, N. (August 1975).
1291:Astronomy and Astrophysics
893:10.1051/0004-6361:20079134
863:Astronomy and Astrophysics
616:This star was found to be
1870:
1844:
1818:
1452:Apus in Chinese astronomy
1447:
1209:10.1134/S1063773712110035
1005:10.1134/S1063772917010085
835:10.1134/S1063773712050015
545:apparent visual magnitude
537:variable star designation
495:
462:
455:
451:
281:
276:
272:
162:
155:
107:
44:
24:
629:chemically peculiar star
582:, which is common for a
1384:2006A&A...454..321K
1303:1997A&A...323..881M
1043:1994A&AS..108..603B
949:2013A&A...551A..30B
885:2008A&A...487..689S
761:2018A&A...616A...1G
258:Absolute magnitude
97:Apparent magnitude
1922:Durchmusterung objects
1457:List of stars in Apus
1441:Constellation of Apus
1261:Millennium Star Atlas
1152:10.1093/mnras/stu1259
668:effective temperature
660:luminosity of the Sun
640:quadrupolar component
638:, and shows a strong
631:, measured at around
1098:10.1093/mnras/stx674
563:of +0.50 km/s.
1337:1975PASP...87..527C
1201:2012AstL...38..694G
1143:2014MNRAS.443.1629S
1089:2017MNRAS.468.2745N
997:2017ARep...61...80S
827:2012AstL...38..331A
701:1991IBVS.3655....1L
533:Triangulum Australe
496:Database references
411:Rotational velocity
207: −15.503
195: −16.276
21:
670:of 13,100 K.
654:and 2.8 times the
457:Other designations
145:Variable type
114:Spectral type
19:
1932:Hipparcos objects
1907:Helium-weak stars
1884:
1883:
1866:
1865:
1840:
1839:
1814:
1813:
1765:
1764:
1179:Astronomy Letters
985:Astronomy Reports
805:Astronomy Letters
514:
513:
1944:
1876:
1875:
1846:
1820:
1778:
1552:R (not variable)
1472:
1434:
1427:
1420:
1411:
1404:
1403:
1377:
1375:astro-ph/0603831
1357:
1351:
1350:
1348:
1313:
1307:
1306:
1286:
1275:
1274:
1256:
1250:
1249:
1247:
1246:
1226:
1220:
1219:
1194:
1174:
1165:
1164:
1154:
1136:
1112:
1103:
1102:
1100:
1082:
1073:(3): 2745–2756.
1058:
1047:
1046:
1026:
1017:
1016:
980:
969:
968:
942:
922:
905:
904:
878:
858:
847:
846:
820:
800:
785:
775:
773:
763:
753:
720:
705:
704:
684:
637:
601:
597:
523:in the southern
473:
431:
429:
404:
386:
384:
299:
297:
206:
194:
139:
137:
122:
108:Characteristics
100:
80:
75:
45:Observation data
30:
22:
1952:
1951:
1947:
1946:
1945:
1943:
1942:
1941:
1887:
1886:
1885:
1880:
1862:
1858:Sunburst galaxy
1836:
1810:
1794:
1772:
1761:
1742:
1728:137388 (Karaka)
1689:
1581:
1538:
1461:
1443:
1438:
1408:
1407:
1359:
1358:
1354:
1315:
1314:
1310:
1288:
1287:
1278:
1271:
1258:
1257:
1253:
1244:
1242:
1228:
1227:
1223:
1185:(11): 694–706,
1176:
1175:
1168:
1114:
1113:
1106:
1060:
1059:
1050:
1028:
1027:
1020:
982:
981:
972:
924:
923:
908:
860:
859:
850:
802:
801:
788:
724:Brown, A. G. A.
722:
721:
708:
686:
685:
681:
676:
652:mass of the Sun
644:rotation period
632:
627:recorded for a
625:magnetic fields
618:photometrically
600:B8 He wk SiCrFe
599:
595:
584:peculiar A star
568:peculiar A star
561:radial velocity
491:
468:
427:
425:
417: sin
402:
382:
380:
355:Surface gravity
347:
344:
327:
324:
307:
304:
295:
293:
263:
246:
203:
179:+0.50 km/s
174:
169:Radial velocity
135:
133:
121:B8 He wk SiCrFe
120:
119:
95:
78:
73:Right ascension
71:
46:
40:
31:
17:
12:
11:
5:
1950:
1948:
1940:
1939:
1934:
1929:
1924:
1919:
1914:
1909:
1904:
1899:
1889:
1888:
1882:
1881:
1871:
1868:
1867:
1864:
1863:
1861:
1860:
1854:
1852:
1842:
1841:
1838:
1837:
1835:
1834:
1828:
1826:
1816:
1815:
1812:
1811:
1809:
1808:
1802:
1800:
1796:
1795:
1793:
1792:
1786:
1784:
1775:
1767:
1766:
1763:
1762:
1760:
1759:
1750:
1748:
1744:
1743:
1741:
1740:
1735:
1730:
1725:
1720:
1715:
1710:
1705:
1699:
1697:
1691:
1690:
1688:
1687:
1682:
1677:
1672:
1667:
1662:
1657:
1652:
1647:
1642:
1637:
1632:
1627:
1622:
1617:
1612:
1607:
1602:
1597:
1591:
1589:
1583:
1582:
1580:
1579:
1574:
1569:
1564:
1559:
1554:
1548:
1546:
1540:
1539:
1537:
1536:
1531:
1526:
1521:
1516:
1511:
1506:
1501:
1496:
1491:
1486:
1480:
1478:
1469:
1463:
1462:
1460:
1459:
1454:
1448:
1445:
1444:
1439:
1437:
1436:
1429:
1422:
1414:
1406:
1405:
1368:(1): 321–325.
1352:
1346:10.1086/129803
1308:
1276:
1269:
1251:
1221:
1166:
1104:
1048:
1018:
970:
906:
848:
786:
706:
678:
677:
675:
672:
588:metallic lines
512:
511:
506:
498:
497:
493:
492:
482: 137509,
463:
460:
459:
453:
452:
449:
448:
442:
434:
433:
423:
406:
405:
400:
392:
391:
378:
370:
369:
363:
350:
349:
345:
342:
338:
330:
329:
325:
322:
318:
310:
309:
305:
302:
291:
283:
282:
279:
278:
274:
273:
270:
269:
266:
261:
253:
252:
247:(198 ± 2
240:
232:
231:
225:
216:
215:
190:
181:
180:
177:
172:
164:
163:
160:
159:
153:
152:
147:
141:
140:
131:
124:
123:
116:
110:
109:
105:
104:
101:
92:
91:
88:
82:
81:
79:15 31 27.11494
76:
68:
67:
62:
56:
55:
42:
41:
25:
15:
13:
10:
9:
6:
4:
3:
2:
1949:
1938:
1935:
1933:
1930:
1928:
1925:
1923:
1920:
1918:
1915:
1913:
1910:
1908:
1905:
1903:
1900:
1898:
1895:
1894:
1892:
1879:
1869:
1859:
1856:
1855:
1853:
1851:
1847:
1843:
1833:
1830:
1829:
1827:
1825:
1821:
1817:
1807:
1804:
1803:
1801:
1797:
1791:
1788:
1787:
1785:
1783:
1779:
1776:
1774:
1768:
1758:
1756:
1752:
1751:
1749:
1745:
1739:
1736:
1734:
1731:
1729:
1726:
1724:
1721:
1719:
1716:
1714:
1711:
1709:
1706:
1704:
1701:
1700:
1698:
1696:
1692:
1686:
1683:
1681:
1678:
1676:
1673:
1671:
1668:
1666:
1663:
1661:
1658:
1656:
1653:
1651:
1648:
1646:
1643:
1641:
1638:
1636:
1633:
1631:
1628:
1626:
1623:
1621:
1618:
1616:
1613:
1611:
1608:
1606:
1603:
1601:
1598:
1596:
1593:
1592:
1590:
1588:
1584:
1578:
1575:
1573:
1570:
1568:
1565:
1563:
1560:
1558:
1555:
1553:
1550:
1549:
1547:
1545:
1541:
1535:
1532:
1530:
1527:
1525:
1522:
1520:
1517:
1515:
1512:
1510:
1507:
1505:
1502:
1500:
1497:
1495:
1492:
1490:
1487:
1485:
1482:
1481:
1479:
1477:
1473:
1470:
1468:
1464:
1458:
1455:
1453:
1450:
1449:
1446:
1442:
1435:
1430:
1428:
1423:
1421:
1416:
1415:
1412:
1401:
1397:
1393:
1389:
1385:
1381:
1376:
1371:
1367:
1363:
1356:
1353:
1347:
1342:
1338:
1334:
1330:
1326:
1322:
1318:
1317:Cowley, A. P.
1312:
1309:
1304:
1300:
1296:
1292:
1285:
1283:
1281:
1277:
1272:
1270:0-933346-83-2
1266:
1262:
1255:
1252:
1241:
1237:
1236:
1231:
1225:
1222:
1218:
1214:
1210:
1206:
1202:
1198:
1193:
1188:
1184:
1180:
1173:
1171:
1167:
1162:
1158:
1153:
1148:
1144:
1140:
1135:
1130:
1126:
1122:
1118:
1111:
1109:
1105:
1099:
1094:
1090:
1086:
1081:
1076:
1072:
1068:
1064:
1057:
1055:
1053:
1049:
1044:
1040:
1036:
1032:
1025:
1023:
1019:
1014:
1010:
1006:
1002:
998:
994:
990:
986:
979:
977:
975:
971:
966:
962:
958:
954:
950:
946:
941:
936:
932:
928:
921:
919:
917:
915:
913:
911:
907:
902:
898:
894:
890:
886:
882:
877:
872:
869:(2): 689–96.
868:
864:
857:
855:
853:
849:
844:
840:
836:
832:
828:
824:
819:
814:
810:
806:
799:
797:
795:
793:
791:
787:
783:
779:
772:
767:
762:
757:
752:
747:
743:
739:
738:
733:
731:
725:
719:
717:
715:
713:
711:
707:
702:
698:
694:
690:
683:
680:
673:
671:
669:
665:
661:
657:
653:
649:
645:
641:
636:
630:
626:
622:
619:
614:
612:
609:
605:
602:, matching a
593:
592:Hg–Mn Ap star
589:
585:
581:
580:main sequence
577:
573:
569:
564:
562:
558:
554:
550:
546:
542:
538:
535:. It has the
534:
530:
526:
525:constellation
522:
518:
510:
507:
505:
504:
500:
499:
494:
490: 257290
489:
486: 76011,
485:
481:
478: 20810,
477:
471:
466:
461:
458:
454:
450:
447:
443:
441:
440:
436:
435:
424:
422:
420:
416:
412:
408:
407:
401:
399:
398:
394:
393:
390:
379:
377:
376:
372:
371:
368:
364:
362:
360:
356:
352:
351:
348:
339:
337:
336:
332:
331:
328:
319:
317:
316:
312:
311:
308:
292:
290:
289:
285:
284:
280:
275:
271:
267:
265:
259:
255:
254:
250:
245:
242:647 ± 6
241:
239:
238:
234:
233:
230:
226:
224:
222:
218:
217:
214:
210:
202:
198:
191:
189:
187:
186:Proper motion
183:
182:
178:
176:
170:
166:
165:
161:
158:
154:
151:
148:
146:
143:
142:
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692:
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656:Sun's radius
615:
596:B9p (SiCrFe)
576:A. P. Cowley
565:
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403:4.492 d
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184:
167:
118:B9p (SiCrFe)
1331:: 527–528.
1297:: 881–885.
1127:(2): 1629.
1037:: 603–609.
664:photosphere
608:helium-weak
549:light years
375:Temperature
129:color index
86:Declination
37:light curve
34:visual band
1891:Categories
1245:2020-12-27
1192:1606.09028
1080:1703.05218
811:(5): 331.
751:1804.09365
674:References
432: km/s
357:(log
335:Luminosity
320:2.81
157:Astrometry
20:HD 137509
1832:Hen 2-131
1217:119108982
1134:1406.6093
1013:125853869
991:(1): 80.
940:1301.3050
876:0806.1296
843:119257644
818:1108.4971
662:from its
604:late-type
555:based on
551:from the
541:NN Apodis
517:HD 137509
444:124
365:4.3
340:123
99: (V)
1902:Ap stars
1878:Category
1850:Galaxies
1773:clusters
1755:Godzilla
1544:Variable
1400:17058487
1161:96452769
965:59291051
901:14113957
633:29
621:variable
557:parallax
472:−70°1302
397:Rotation
346:☉
326:☉
306:☉
260: (M
237:Distance
221:Parallax
1824:Nebulae
1806:IC 4499
1380:Bibcode
1333:Bibcode
1299:Bibcode
1230:"9 Cet"
1197:Bibcode
1139:Bibcode
1085:Bibcode
1039:Bibcode
993:Bibcode
945:Bibcode
933:: A30.
881:Bibcode
823:Bibcode
756:Bibcode
697:Bibcode
611:Bp star
572:spectra
277:Details
52:Equinox
1738:152010
1733:141846
1723:137366
1718:134606
1713:131664
1708:129899
1703:128294
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1267:
1235:SIMBAD
1215:
1159:
1011:
963:
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782:VizieR
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666:at an
519:is a
503:SIMBAD
465:NN Aps
387:
381:13,100
315:Radius
300:
134:−0.125
54:J2000
1799:Other
1747:Other
1476:Bayer
1467:Stars
1396:S2CID
1370:arXiv
1213:S2CID
1187:arXiv
1157:S2CID
1129:arXiv
1075:arXiv
1009:S2CID
961:S2CID
935:arXiv
897:S2CID
871:arXiv
839:S2CID
813:arXiv
776:
746:arXiv
695:: 1.
205:Dec.:
150:α CVn
138:0.004
103:6.89
48:Epoch
1917:Apus
1790:6101
1771:Star
1757:star
1685:6751
1680:6731
1675:6646
1670:6635
1665:6373
1660:6357
1655:6135
1650:5955
1645:5786
1640:5757
1635:5628
1630:5555
1625:5547
1620:5520
1615:5389
1610:5327
1605:5306
1600:5279
1595:5240
1265:ISBN
730:Gaia
693:3655
529:Apus
521:star
509:data
298:0.17
294:3.43
288:Mass
268:0.45
127:B−V
65:Apus
32:The
1782:NGC
1388:doi
1366:454
1341:doi
1295:323
1205:doi
1147:doi
1125:443
1093:doi
1071:468
1035:108
1001:doi
953:doi
931:551
889:doi
867:487
831:doi
780:at
766:doi
742:616
598:or
553:Sun
539:of
527:of
488:SAO
484:HIP
446:Myr
439:Age
385:500
367:cgs
229:mas
223:(π)
209:mas
197:mas
193:RA:
188:(μ)
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1587:HR
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1572:NN
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480:HD
476:GC
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470:CD
467:,
426:20
249:pc
244:ly
213:yr
201:yr
171:(R
1562:Z
1557:S
1534:κ
1529:κ
1524:ι
1519:θ
1514:η
1509:ζ
1504:ε
1499:δ
1494:γ
1489:β
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