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GD 358

A white-light light curve for GD 358, adapted from Winget et al. (1982)
Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Hercules
Right ascension	16 47 19.02
Declination	+32° 28′ 31.9″
Apparent magnitude (V)	13.65
Characteristics
Spectral type	DBV2
B−V color index	-0.1
Variable type	DBV
Astrometry
Proper motion (μ)	RA: 6 mas/yr Dec.: -162 mas/yr
Parallax (π)	23.2012 ± 0.0298 mas
Distance	140.6 ± 0.2 ly (43.10 ± 0.06 pc)
Absolute magnitude (MV)	+10.33
Details
Mass	0.584 M☉
Radius	0.0110 R☉
Luminosity	0.0676 L☉
Surface gravity (log g)	7.92 cgs
Temperature	24,937 K
Other designations
EGGR 239, V777 Her, PG 1645+325, WD 1645+325.
Database references
SIMBAD	data

GD 358 is a variable white dwarf star of the DBV type. Like other pulsating white dwarfs, its variability arises from non-radial gravity wave pulsations within the star itself. GD 358 was discovered during the 1958–1970 Lowell Observatory survey for high proper motion stars in the Northern Hemisphere. Although it did not have high proper motion, it was noticed that it was a very blue star, and hence might be a white dwarf. Greenstein confirmed this in 1969.

In 1968, Arlo U. Landolt discovered the first intrinsically variable white dwarf when he found that HL Tau 76 varied in brightness with a period of approximately 749.5 seconds, or 12.5 minutes. By the middle of the 1970s, a number of additional variable white dwarfs had been found, but, like HL Tau 76, they were all white dwarfs of spectral type DA, with hydrogen-dominated atmospheres. In 1982, calculations by Don Winget and his coworkers suggested that helium-atmosphere DB white dwarfs with surface temperatures around 19,000 K should also pulsate. Winget then searched for such stars and found that GD 358 was a variable DB, or DBV, white dwarf. This was the first prediction of a class of variable stars before their observation. In 1985, this star was given the variable-star designation V777 Herculis, which is also another name for this class of variable stars.

Notes and references

1. ^ Winget, D. E.; Robinson, E. L.; Nather, R. E.; Fontaine, G. (1982-11-01). "Photometric observations of GD 358 : OB white dwarfs do pulsate". The Astrophysical Journal. 262: L11 – L15. Bibcode:1982ApJ...262L..11W. doi:10.1086/183902. ISSN 0004-637X.
2. ^ "GD 358". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved June 12, 2007.
3. ^ A Catalog of Spectroscopically Identified White Dwarfs, George P. McCook and Edward M. Sion, Astrophysical Journal Supplement 121, #1 (March 1999), pp. 1–130. CDS ID III/210.
4. 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.
5. ^ Limoges, M. -M; Bergeron, P.; Lépine, S. (2015). "Physical Properties of the Current Census of Northern White Dwarfs within 40 pc of the Sun". The Astrophysical Journal Supplement Series. 219 (2): 19. arXiv:1505.02297. Bibcode:2015ApJS..219...19L. doi:10.1088/0067-0049/219/2/19. S2CID 118494290.
6. Córsico, A. H.; Uzundag, M.; Kepler, S. O.; Silvotti, R.; Althaus, L. G.; Koester, D.; Baran, A. S.; Bell, K. J.; Bischoff-Kim, A.; Hermes, J. J.; Kawaler, S. D.; Provencal, J. L.; Winget, D. E.; Montgomery, M. H.; Bradley, P. A.; Kleinman, S. J.; Nitta, A. (2022). "Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS. III. Asteroseismology of the DBV star GD 358". Astronomy & Astrophysics. 659: A30. arXiv:2111.15551. Bibcode:2022A&A...659A..30C. doi:10.1051/0004-6361/202142153. S2CID 244729212.
7. ^ Bédard, A.; Bergeron, P.; Fontaine, G. (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. S2CID 119359723.
8. Winget, D E (1998-12-14). "Asteroseismology of white dwarf stars". Journal of Physics: Condensed Matter. 10 (49): 11247–11261. Bibcode:1998JPCM...1011247W. doi:10.1088/0953-8984/10/49/014. ISSN 0953-8984. S2CID 250749380.
9. Lowell Proper Motion Survey: 8991 Stars with m > 8, PM > 0.26"/year in the Northern Hemisphere, H. L. Giclas, R. Burnham, Jr., N. G. Thomas, Flagstaff, AZ: Lowell Observatory, 1971. CDS ID I/79.
10. A list of white dwarf suspects II : special objects of small proper motion from the Lowell survey, Henry L. Giclas, Robert Burnham, and Norman Gene Thomas, Bulletin, Lowell Observatory, #141 (7, #4, 1967), pp. 49–54.
11. The Lowell Suspect White Dwarfs, Jesse L. Greenstein, Astrophysical Journal 158 (October 1969), pp. 281–293.
12. A New Short-Period Blue Variable, Arlo U. Landolt, Astrophysical Journal 153, #1 (July 1968), pp. 151–164.
13. Observations of variable white dwarfs: one new variable and 35 nonvariables, E. L. Robinson and J. T. McGraw, Astrophysical Journal 207 (July 1976), pp. L37–L40.
14. High-frequency stellar oscillations. XI. The ZZ Ceti star BPM 30551, J. E. Hesser, B. M. Lasker, and H. E. Neupert, Astrophysical Journal 209 (November 1976), pp. 853–857.
15. BPM 31594: a new southern-hemisphere variable white dwarf, J. T. McGraw, Astrophysical Journal 210 (November 1976), pp. L35–L38.
16. Hydrogen-driving and the blue edge of compositionally stratified ZZ Ceti star models, D. E. Winget, H. M. van Horn, M. Tassoul, G. Fontaine, C. J. Hansen, and B. W. Carroll, Astrophysical Journal 252 (January 15, 1982), pp. L65–L68.
17. White Dwarf Stars, Steven D. Kawaler, in Stellar remnants, S. D. Kawaler, I. Novikov, and G. Srinivasan, edited by Georges Meynet and Daniel Schaerer, Berlin: Springer, 1997. Lecture notes for Saas-Fee advanced course number 25. ISBN 3-540-61520-2.
18. The 67th Name-List of Variable Stars, P. N. Kholopov, N. N. Samus, E. V. Kazarovets, and N. B. Perova, Information Bulletin on Variable Stars, #2681, March 8, 1985.
19. White dwarfs, Gilles Fontaine and François Wesemael, in Encyclopedia of Astronomy and Astrophysics, ed. Paul Murdin, Bristol and Philadelphia: Institute of Physics Publishing and London, New York and Tokyo: Nature Publishing Group, 2001. ISBN 0-333-75088-8.

v t e Constellation of Hercules
Hercules–Corona Borealis Great Wall Hercules in Chinese astronomy List of stars in Hercules
Stars	Bayer α (Rasalgethi) β (Kornephoros) γ δ (Sarin) ε ζ η θ ι κ (Marsic) λ (Maasym) μ ν ξ ο π ρ σ τ υ φ χ ψ ψ ω (Cujam) Flamsteed 14 29 (h) 30 (g) 42 45 (l) 52 60 68 (u) 69 (e) 72 (w) 89 93 98 99 (b) 102 104 (A) 106 109 110 111 112 32 Oph Variable X AC AM BL DI DQ V446 V533 V772 V777 V838 V1674 HR 6669 6697 6806 HD 146389 (Irena) 147506 (Hunor) 149026 (Ogma) 152843 154345 155358 156668 159062 164595 164922 Other BD +17° 3248 Furuhjelm 46 GD 362 Gliese 623 Gliese 638 Gliese 649 Gliese 686 GJ 3991 HAT-P-14 (Franz) HAT-P-18 HAT-P-67 Hercules X-1 GSC 02620-00648 Ross 640 TOI-2119 TrES-3 (Pipoltr) TYC 1031-1262-1 WASP-103 WISE 1738+2732 WISE 1741+2553
Exoplanets 14 Herculis b c HAT-P-14b (Sissi) HD 149026 b (Smertrios) HD 164922 b c WASP-103b
Star clusters Messier 13 Messier 92 NGC 6229 Palomar 14
Nebulae Abell 39 NGC 6210
Galaxies	NGC 6028 6039 6040 6041 6042 6043 6044 6045 6046 6047 6052 6053 6054 6055 6056 6057 6061 6078 6158 6166 6181 6207 6212 6239 6261 6263 6308 6452 6560 Other 1ES 1741+196 2MASX J16270254+4328340 3C 345 3C 346 A2261-BCG Arp 272 (NGC 6050 and IC 1179) AT2018cow IC 1182 IC 1189 Hercules Dwarf Hercules A IC 1192 IC 4617 Markarian 501 MCG+07-33-027 PGC 2046648 QSR J1819+3845 RX J1633.3+4718 UGC 11105
Galaxy clusters Abell 2152 Abell 2199 Hercules Cluster Hercules Superclusters Zwicky's Triplet
Astronomical events LBG-2377
Category

• Hercules (constellation)
• Pulsating white dwarfs
• Objects with variable star designations