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HR Delphini was discovered 158 days before it reached peak brightness, and its light curve around the peak was very well observed. It had a very slow rise to maximum brightness, when compared to other classical novae. It took 230 days for HR Delphini to fade from its peak by 3 magnitudes, which makes
213:
at 22:35 UT on 8 July 1967, after searching the sky for over 800 hours with binoculars. At the time of discovery it had an apparent magnitude of 5.0. It reached a peak brightness of magnitude 3.5 on 13 December 1967, making it easily visible to the naked eye around that time. Pre-outburst
240:. The two stars are so close to each other that material is transferred from the donor to the white dwarf. In the case of HR Delphini, the orbital period of the binary pair is 5.14 hours. The mass of the white dwarf is estimated to be between 0.6 and 0.75
278:
of oxygen and nitrogen. It is roughly ellipsoidal, with a central ring around the equatorial region. It had a size of 3.7 × 2.5 arc seconds when it was discovered in 1981, and had expanded to roughly 8.5 × 6.1 arc seconds when it was observed with the
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it a "slow" nova. Its decline from peak brightness showed several brief outbursts, leading to its light curve being classified as type "J" (for "jitters").
1435:
533:
161:
Nova Delphini 1967, HR Del, AAVSO 2037+18, 2MASS J20422035+1909394. Gaia DR2 1813953083546374144
837:"Hubble Space Telescope imaging and ground-based spectroscopy of old nova shells - II. The bipolar shell of the slow nova HR Del"
786:"Spatio-kinematic models of five nova remnants: Correlations between nova shell axial ratio, expansion velocity, and speed class"
275:
894:
474:"A UV and optical study of 18 old novae with Gaia DR2 distances: mass accretion rates, physical parameters, and MMRD"
49:
919:
357:
660:
Tappert, C.; Vogt, N.; Ederoclite, A.; Schmidtobreick, L.; Vuˇckovi ́c, M.; Becegato, L.L. (September 2020).
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Santamaría, E.; Guerrero, M. A.; Zavala, S.; Ramos-Larios, G.; Toalá, J. A.; Sabin, L. (2022).
280:
230:
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1109:
1016:
770:
687:
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435:
340:
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and the donor star is believed to be a main sequence star with a mass between 0.52 and 0.58
848:
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Kuerster, M.; Barwig, H. (June 1988). "A spectroscopic study of the old nova HR Delphini".
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In June 1970, HR Delphini was detected in 3.7 cm and 11.1 cm radio wavelengths with the
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662:"The luminosity evolution of nova shells. I. A new analysis of old data"
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showed it as a ~12th magnitude star which might have been variable.
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Data
Release 2: Summary of the contents and survey properties"
595:
Isles, J. E. (1974). "HR Delphini (Nova 1967) in 1967 - 71".
929:
236:
All novae are binary stars, with a "donor" star orbiting a
199:
116:
554:
Candy, M.P.; Alcock, G.E.D.; Zissell, R.E. (July 1967).
472:
Selvelli, Pierluigi; Gilmozzi, Roberto (February 2019).
191:
The light curve of HR Delphini, plotted from AAVSO data.
621:
379:"A Reference Catalogue and Atlas of Galactic Novae"
553:
306:; et al. (Gaia collaboration) (August 2018).
841:Monthly Notices of the Royal Astronomical Society
834:
790:Monthly Notices of the Royal Astronomical Society
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624:"Pre-Maximum Observations of Nova Delphini 1967"
471:
622:van den Bergh, Sydney; Racine, R. (July 1967).
597:Journal of the British Astronomical Association
902:
756:
888:
710:
534:Centre de données astronomiques de Strasbourg
436:"The unusual nature of nova HR Delphini 1967"
16:1967 Nova seen in the constellation Delphinus
1279:
835:Harman, D.J.; O'Brien, T.J. (October 2003).
711:Hjellming, R.M.; Wade, C.M. (October 1970).
594:
88:+19° 09′ 39.30″
895:
881:
777:
198:, also known as Nova Delphini 1967, was a
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48:J2000
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37:Location of HR Delphini (circled in red)
1436:Objects with variable star designations
263:HR Delphini is surrounded by a bipolar
1413:
1315:
628:Information Bulletin on Variable Stars
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377:Duerbeck, Hilmar W. (March 1987).
14:
1452:
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862:10.1046/j.1365-8711.2003.06906.x
434:Friedjung, M. (September 1992).
209:in 1967. It was discovered by
29:
358:Gaia DR2 record for this source
920:Delphinus in Chinese astronomy
1:
286:
666:Astronomy & Astrophysics
478:Astronomy & Astrophysics
317:Astronomy & Astrophysics
260:in the range of K5V to M1V.
7:
697:10.1051/0004-6361/202037913
509:10.1051/0004-6361/201834238
351:10.1051/0004-6361/201833051
214:photographs taken with the
10:
1457:
915:List of stars in Delphinus
904:Constellation of Delphinus
759:Astronomy and Astrophysics
440:Astronomy and Astrophysics
229:, and at 1.95 cm with the
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717:The Astrophysical Journal
227:Green Bank Interferometer
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105:
42:
24:
771:1988A&A...199..201K
688:2020A&A...641A.122T
500:2019A&A...622A.186S
452:1992A&A...262..487F
341:2018A&A...616A...1G
216:Samuel Oschin telescope
95:Apparent magnitude
281:Hubble Space Telescope
202:which appeared in the
192:
821:10.1093/mnras/stac563
383:Space Science Reviews
190:
556:"Nova Delphini 1967"
233:140 foot telescope.
853:2003MNRAS.344.1219H
812:2022MNRAS.512.2003S
729:1970ApJ...162L...1H
640:1967IBVS..212....1V
609:1974JBAA...85...54I
572:1967IAUC.2022....1C
395:1987SSRv...45....1D
167:Database references
21:
403:10.1007/BF00187826
193:
154:Other designations
112:Variable type
101:3.5 – 12.0 (var.)
19:
1441:Hipparcos objects
1408:
1407:
1390:
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1333:
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1207:HAT-P-23 (Moriah)
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847:(4): 1219–1226.
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796:(2): 2003–2013.
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524:"V* HR Delphini"
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43:Observation data
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1217:WISE J2030+0749
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304:Brown, A. G. A.
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276:forbidden lines
268:emission nebula
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71:Right ascension
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737:10.1086/180610
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141:932 ± 31
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117:Classical Nova
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1281:Star clusters
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1248:18 Delphini b
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713:"Radio Novae"
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389:(1–2): 1–14.
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270:, visible in
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258:spectral type
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211:George Alcock
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204:constellation
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58:Constellation
56:
55:
51:
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41:
32:
23:
1258:HD 196885 Ab
1097:
1082:
1004:
1001:
972:ε (Aldulfin)
947:α (Sualocin)
844:
840:
830:
793:
789:
779:
762:
758:
752:
740:. Retrieved
720:
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706:
669:
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655:
643:. Retrieved
631:
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596:
575:. Retrieved
563:
560:IAU Circular
559:
549:
537:. Retrieved
527:
518:
481:
477:
467:
455:. Retrieved
443:
439:
414:. Retrieved
386:
382:
321:
315:
309:
265:nova remnant
262:
235:
224:
220:
195:
194:
172:
134:
77:20 42 20.347
20:HR Delphini
1253:HD 195019 b
1060:18 (Musica)
952:β (Rotanev)
765:: 201–210.
742:29 December
645:29 December
577:29 December
539:29 December
457:29 December
446:: 487–490.
416:24 December
238:white dwarf
196:HR Delphini
84:Declination
1415:Categories
1240:Exoplanets
803:2202.13946
679:2007.10940
491:1903.05868
331:1804.09365
287:References
231:Green Bank
124:Astrometry
1426:Delphinus
1289:Laevens 3
1017:Flamsteed
603:: 54–58.
411:115854775
283:in 1997.
207:Delphinus
97: (V)
63:Delphinus
1402:Category
1382:ZW II 96
1339:Galaxies
1325:NGC 6905
1299:NGC 7006
1294:NGC 6934
1070:Variable
1005:(Tso Ke)
672:: A122.
484:: A186.
254:☉
246:☉
136:Distance
1317:Nebulae
1263:WASP-2b
849:Bibcode
808:Bibcode
767:Bibcode
725:Bibcode
684:Bibcode
636:Bibcode
605:Bibcode
568:Bibcode
496:Bibcode
448:Bibcode
391:Bibcode
336:Bibcode
256:with a
50:Equinox
1212:WASP-2
1191:195019
1099:QV Sge
1003:ρ Aql
723:: L1.
529:SIMBAD
409:
362:VizieR
324:. A1.
174:SIMBAD
52:J2000
1421:Novae
1375:Other
1200:Other
939:Bayer
930:Stars
798:arXiv
674:arXiv
634:: 1.
566:: 1.
486:arXiv
407:S2CID
356:
326:arXiv
46:Epoch
1366:7028
1361:7025
1356:7003
1173:8044
1168:8010
1163:7975
1158:7907
1153:7899
1148:7839
1143:7824
1138:7816
1133:7793
1128:7778
1123:7774
1118:7771
1093:V339
744:2020
647:2020
579:2020
564:2022
541:2020
459:2020
418:2020
310:Gaia
200:nova
180:data
1348:NGC
857:doi
845:344
816:doi
794:512
763:199
733:doi
721:162
692:doi
670:641
632:212
504:doi
482:622
444:262
399:doi
360:at
346:doi
322:616
1417::
1183:HD
1110:HR
1088:HU
1083:HR
1078:EU
1055:17
1050:16
1045:15
1040:14
1035:13
1030:10
855:.
843:.
839:.
814:.
806:.
792:.
788:.
761:.
731:.
719:.
715:.
690:.
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668:.
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630:.
626:.
601:85
599:.
587:^
562:.
558:.
532:.
526:.
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476:.
442:.
438:.
426:^
405:.
397:.
387:45
385:.
381:.
369:^
344:.
334:.
320:.
314:.
295:^
272:Hα
143:pc
1025:1
997:κ
992:ι
987:θ
982:η
977:ζ
967:δ
962:γ
957:γ
896:e
889:t
882:v
865:.
859::
851::
824:.
818::
810::
800::
773:.
769::
746:.
735::
727::
700:.
694::
686::
676::
649:.
638::
611:.
607::
581:.
570::
543:.
512:.
506::
498::
488::
461:.
450::
420:.
401::
393::
364:.
354:.
348::
338::
328::
308:"
251:M
243:M
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