G 185-32 - Misplaced Pages

(Redirected from PY Vulpeculae) White dwarf in the constellation Vulpecula

G 185-32
Observation data Epoch J2000 Equinox J2000
A light curve for PY Vulpeculae, adapted from McGraw et al. (1981)
Constellation	Vulpecula
Right ascension	19 37 13.7502
Declination	+27° 43′ 18.7366″
Apparent magnitude (V)	13.00
Characteristics
Spectral type	DA4.0
Apparent magnitude (J)	13.183±0.023
Apparent magnitude (H)	13.213±0.029
Apparent magnitude (K)	13.329±0.043
B−V color index	0.17
Variable type	ZZA
Astrometry

Proper motion (μ)	RA: 439.597±0.044 mas/yr Dec.: 21.270±0.049 mas/yr
Parallax (π)	54.7742 ± 0.0288 mas
Distance	59.55 ± 0.03 ly (18.257 ± 0.010 pc)
Absolute magnitude (M_V)	11.66

Details

Mass	0.64±0.10 `M`_☉
Radius	0.0120±0.0006 `R`_☉
Surface gravity (log g)	8.09±0.05 cgs
Temperature	12381±186 K

Other designations
PY Vul, EGGR 277, LSPM J1937+2743, USNO-B1.0 1177-00513805, WD 1935+276, USNO 352, WD 1935+27, NLTT 48026, GJ 1241, PG 1935+276.
Database references
SIMBAD	data
ARICNS	data

G 185-32, also known by the variable star designation PY Vulpeculae, is a white dwarf in the constellation Vulpecula. Located approximately 18.3 parsecs (60 ly) distant, the stellar remnant is a ZZ Ceti variable, varying by 0.02 apparent magnitudes from the mean of 13.00.

Observational history

This star was first noticed during a survey for high proper motion stars by Henry L. Giclas, at Lowell Observatory, who listed it as a suspected white dwarf. The white dwarf designation was confirmed spectroscopically in 1970 by astronomer Jesse L. Greenstein of the California Institute of Technology.

References

McGraw, J. T.; Fontaine, G.; Dearborn, G. S. P.; Gustafson, J.; Lacombe, P.; Starrfield, S. G. (November 1981). "Two new variable white dwarfs : G 185-32 and G 191-16". The Astrophysical Journal. 250: 349–354. Bibcode:1981ApJ...250..349M. doi:10.1086/159381. Retrieved 26 May 2022.
^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
^ VSX (4 January 2010). "PY Vulpeculae". AAVSO Website. American Association of Variable Star Observers. Retrieved 19 October 2014.
Gianninas, A.; et al. (2011). "A Spectroscopic Survey and Analysis of Bright, Hydrogen-Rich White Dwarfs". The Astrophysical Journal. 743 (2). 138. arXiv:1109.3171. Bibcode:2011ApJ...743..138G. doi:10.1088/0004-637X/743/2/138.
^ Skrutskie, Michael F.; Cutri, Roc M.; Stiening, Rae; Weinberg, Martin D.; Schneider, Stephen E.; Carpenter, John M.; Beichman, Charles A.; Capps, Richard W.; Chester, Thomas; Elias, Jonathan H.; Huchra, John P.; Liebert, James W.; Lonsdale, Carol J.; Monet, David G.; Price, Stephan; Seitzer, Patrick; Jarrett, Thomas H.; Kirkpatrick, J. Davy; Gizis, John E.; Howard, Elizabeth V.; Evans, Tracey E.; Fowler, John W.; Fullmer, Linda; Hurt, Robert L.; Light, Robert M.; Kopan, Eugene L.; Marsh, Kenneth A.; McCallon, Howard L.; Tam, Robert; Van Dyk, Schuyler D.; Wheelock, Sherry L. (1 February 2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal. 131 (2): 1163–1183. Bibcode:2006AJ....131.1163S. doi:10.1086/498708. ISSN 0004-6256. S2CID 18913331. Vizier catalog entry
Bédard, A.; et al. (2017). "Measurements of Physical Parameters of White Dwarfs: A Test of the Mass–Radius Relation". The Astrophysical Journal. 848 (1). 11. arXiv:1709.02324. Bibcode:2017ApJ...848...11B. doi:10.3847/1538-4357/aa8bb6.
Giclas, Henry L.; et al. (1966). "Lowell proper motions VIII : proper motion survey of the Northern Hemisphere with the 13-inch photographic telescope of the Lowell Observatory". Lowell Observatory Bulletin. 6 (132): 233–247. Bibcode:1966LowOB...6..233G.
Greenstein, Jesse L. (1970). "Some New White Dwarfs with Peculiar Spectra. VI". Astrophysical Journal Letters. 162: L55–L59. Bibcode:1970ApJ...162L..55G. doi:10.1086/180622.

Constellation of Vulpecula

Stars

Bayer	α (Anser)
Flamsteed	1 2 3 4 5 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 35 3 Cyg
Variable	R S T U V X Z RS SV VW WW AW BE BO BP BS BW DR ER LT LV MW NQ NR NS PS PU PW PX QQ QR QU QV QY V379 V387 V407 V452 V457 V458
HR	7207 7250 7263 7286 7364 7384 7391 7421 7452 7472 7490 7540 7556 7573 7601 7656 7716 7760 7811 7849 7862 7895 7903 8082 8158 8190 8194 8197 8198
HD	186943 187614 188015 189671 190066 190228 190322 201626
Other	ASKAP J1935+2148 BD+23 3912 G 185-32 GD 385 GS 2000+25 HIP 100963 PSR B1919+21 PSR B1930+22 PSR B1937+21 PSR B1953+29 PSR B2020+28 PSR J1946+2052 PSR J2007+2722 Wolf 1346 WR 125 XTE J1859+226 SGR 1935+2154

Exoplanets	HD 188015 b HD 189733 b

Star clusters	Brocchi's Cluster NGC 6885 NGC 6940

Nebulae	Dumbbell Nebula Hen 2-437 Sh2-88

Galaxies

NGC	7052 7080
Other	3C 433

Astronomical events	AT 2021lwx