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Name
  PU Vul  
AAVSO UID
000-BCL-393 (30706 observations)  
Constellation
Vulpecula Sequence
J2000.0
20 21 13.31 +21 34 18.7  (305.30546 +21.57186) Search nearby
B1950.0 20 19 01.15 +21 24 43.7
Proper motion
RA: -4.585 +/- 2.341 mas/yDec: -6.236 +/- 1.941 mas/ySource: Gaia DR1
Galactic coord. 62.575 -8.532
Other names

(Internal only)
Please note that aliases shown in grey link to obsolete records.
AAVSO 2016+21 ASAS J202114+2134.3 ASASSN-V J202113.29+213418.6
Downes PU Vul NSVS J2021133+213416  
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Variability type
NC
Spectral type A4II-F8Iab+M6IIIe
Mag. range
8.7 - 16.6 p
Discoverer M. Honda, Y. Kuwano
Epoch
--
Outburst 1979
Period 268 d
Rise/eclipse dur. --
Remarks
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1 2013arXiv1312.6063G Pulsation period 138d.
2 GCVS Team Pre-outburst SP M4 (1958). Gradual light increase in 1977 - 79 up to 8.7m V; in 1979 A = 0.29M V, Min I = 2443943.39 + 78.12d*E [D.Chochol, L.Hric, J.Papousek, IBVS N2059, 1981.]. In the max of 1979 Sp F5Ia - F8-9I. In February 1980 an abrupt light decrease started; the star reached V = 13.65m by early September. By September, 1981 the star recovered from the deep Min of 500d duration. During the 1980 - 81 minimum Sp M5 with TiO bands, emissions of Halpha, NaD, [OII], FeII, rare earths. In 1982 - 84 8.35m - 8.87m V, Sp became F again. Simetimes Halpha, Hbeta emissions have been detected, often with P Cyg profiles.
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References
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1 M. Gromadzki, J. Mikolajewska, I. Soszynski, 2013, arXiv:1312.6063
[astro-ph.SR]		 2013arXiv1312.6063G
2 R.A. Downes et al., 2001, PASP 113, 764 (2006 archival version) 2005JAD....11....2D
3 P.R. Wozniak, S.J. Williams, W.T. Vestrand, V. Gupta, AJ 128, 2965, 2004 2004AJ....128.2965W
4 R.A. Downes et al., 2001, PASP 113, 764 2001PASP..113..764D
5 T.S.Belyakina, N.I.Bondar, D.Chochol, K.K.Chuvaev, Yu.S.Efimov,
R.E.Gershberg, J.Grygar, L.Ilric, V.I.Krasnobabtsev, P.P.Petrov,
V.V.Piirola, I.S.Savanov, N.I.Shakhovskaya, N.M.Shakhovskoj, V.I.Shenavrin,
AsAp 132, N2, L 12, 1984.		 1984A&A...132L..12B
6 M.Honda, K.Ishida, T.Noguchi, Y.Norimoto, M.Nakagiri, T.Soyano,
Y.Yamashita, Tokyo Bull, ser.II, N262, 1979.		 --
External Links
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Catalog Data
Information from selected catalogs obtained by cross-matching to 2 arc seconds using the CDS X-Match Service. These data may not be complete.
2MASS J = 7.42H = 6.54K = 6.12J - K = 1.30
AllWISE W1 = 5.92W2 = 5.74W3 = 5.14W4 = 4.32W1 - W2 = 0.18W3 - W4 = 0.82
APASS-DR9 B = 12.88V = 12.55g' = 12.63r' = 11.18i' = 11.02B - V = 0.34
Images
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Supporting Documents
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Campaigns/Programs
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Revision History
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5 Otero, Sebastian Alberto 2018-06-11 00:38 UTC Primary record creation.
4 Admin, VSX 2010-01-05 04:43 UTC Position updated from the GCVS version of November 2009.
3 Admin, VSX 2009-09-23 00:54 UTC Added year of nova outburst.
2 Admin, VSX 2007-03-23 19:52 UTC Discoverer added.
1 Admin, VSX 2005-12-18 01:33 UTC Initial database population.

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