HD 192685

Last updated
HD 192685
Vulpecula constellation map.svg
Red circle.svg
Location of HD 192685 (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Vulpecula
Right ascension 20h 15m 15.89542s [1]
Declination 25° 35′ 31.0549″ [1]
Apparent magnitude  (V)4.60 - 4.80 [2]
Characteristics
Spectral type B3V [3]
U−B color index −0.73 [4]
B−V color index −0.18 [4]
Variable type γ Cas [2]
Astrometry
Radial velocity (Rv)−7.00 [5]  km/s
Proper motion (μ)RA: +6.93 [1]   mas/yr
Dec.: −3.89 [1]   mas/yr
Parallax (π)3.29 ± 0.51  mas [1]
Distance approx. 1,000  ly
(approx. 300  pc)
Absolute magnitude  (MV)−2.56 [6]
Details
Mass 8.0 [7]   M☉
Luminosity 3331 [6]   L☉
Surface gravity (log g)3.49 [8]   cgs
Temperature 18,700 [9]   K
Metallicity [Fe/H]−0.10 [8]   dex
Rotational velocity (v sin i)160 [10]  km/s
Other designations
QR Vul, BD+25°4165, CCDM  J20153+2536AB, GC  28140, HIP  99824, HR  7739, HD  192685, SAO  88410, WDS  J20153+2536AB
Database references
SIMBAD data

HD 192685, also known as QR Vulpeculae or HR 7739, is a Be star about 1,000 ly away in the Vulpecula constellation. It is visible to the naked eye.

Contents

Description

The main plot is a visual band light curve for QR Vulpeculae, adapted from Pavlovski et al. (1983), showing a sudden brightening. The inset plot, adapted from Lefevre et al. (2009), shows the periodic variability. QRVulLightCurve.png
The main plot is a visual band light curve for QR Vulpeculae, adapted from Pavlovski et al. (1983), showing a sudden brightening. The inset plot, adapted from Lefèvre et al. (2009), shows the periodic variability.

HD 192685 varies slightly in brightness and is classified as a γ Cassiopeiae variable. [2]

From October to December 1982 the Hydrogen alpha absorption line increased in emission strength by 30%. [11] The line is partially filled by redshifted emission. [13]

HD 192685 has excess infrared emissions (12-100 μm) which are interpreted to be free-free radiation in the gas surrounding the star. [14]

Companions

It has at least one companion with separation 0.55" and magnitude 7.55, [15] and may also be a long-period spectroscopic binary. [16]

Related Research Articles

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<span class="mw-page-title-main">10 Leonis Minoris</span> Star in the constellation Leo Minor

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<span class="mw-page-title-main">28 Monocerotis</span> Star in the constellation Monoceros

28 Monocerotis is a single star in the equatorial constellation of Monoceros. It has an orange-hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.69. The distance to this star is approximately 450 light years based on parallax, and it has an absolute magnitude of −1.00. The star is drifting further away from the Sun with a radial velocity of +26.7 km/s.

<span class="mw-page-title-main">Sigma Ophiuchi</span> Star in the constellation Ophiuchus

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<span class="mw-page-title-main">Xi Pavonis</span> Triple star system in the constellation Pavo

ξ Pavonis, Latinised as Xi Pavonis, is a triple star system in the southern constellation of Pavo. It is visible to the naked eye as a faint star with a combined apparent visual magnitude of 4.35 The system is located approximately 440 light-years from the Sun based on parallax, and it is drifting further away with a radial velocity of +12 km/s.

<span class="mw-page-title-main">Nu Pegasi</span> Star in the constellation Pegasus

ν Pegasi, Latinized as Nu Pegasi is a single star in the northern constellation of Pegasus. It is an orange-hued star that is faintly visible to the naked eye with an apparent visual magnitude of 4.84. The star is located approximately 261 light years away based on parallax, but is drifting closer with a radial velocity of −19 km/s.

<span class="mw-page-title-main">72 Pegasi</span> Binary star system in the constellation Pegasus

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<span class="mw-page-title-main">17 Persei</span> Star in the constellation Perseus

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<span class="mw-page-title-main">HD 18970</span> Star in the constellation Perseus

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<span class="mw-page-title-main">HD 20468</span> K-type bright giant star in the constellation Perseus

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<span class="mw-page-title-main">QZ Puppis</span> Star in the constellation Puppis

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<span class="mw-page-title-main">PU Puppis</span> Blue-giant star in the constellation Puppis

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<span class="mw-page-title-main">HD 70555</span> Star in the constellation Puppis

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<span class="mw-page-title-main">HD 51799</span> Star in the constellation Puppis

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<span class="mw-page-title-main">HD 61772</span> Star in the constellation Puppis

HD 61772 is a bright giant star in the constellation Puppis. Its apparent magnitude is 4.98 and it is approximately 660 light years away based on parallax.

<span class="mw-page-title-main">HD 50235</span> Star in the constellation Puppis

HD 50235 is a class K5III star located approximately 811 light years away, in the constellation Puppis. Its apparent magnitude is 4.99. HD 50235 made its closest approach to the Sun 7.8 million years ago, at the distance of 137 light years, during which it had an apparent magnitude of 1.13.

<span class="mw-page-title-main">HD 167818</span> Star in the constellation Sagittarius

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<span class="mw-page-title-main">HD 172910</span> Class B2.5V star in the constellation Sagittarius

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<span class="mw-page-title-main">HD 42540</span> Star in the constellation Pictor

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References

  1. 1 2 3 4 5 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv: 0708.1752 . Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID   18759600. Vizier catalog entry
  2. 1 2 3 Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  3. ↑ Walker, G. A. H.; Yang, S.; Witt, A. N.; Fahlman, G. G. (Aug–Sep 1980). "The extinction of HD 200775 by dust in NGC 7023". Publications of the Astronomical Society of the Pacific. 92: 414. Bibcode:1980PASP...92..411W. doi: 10.1086/130687 .
  4. 1 2 Mermilliod, J. C. (2006). "VizieR Online Data Catalog: Homogeneous Means in the UBV System (Mermilliod 1991)". VizieR On-line Data Catalog: II/168. Originally Published in: Institut d'Astronomie. 2168. Bibcode:2006yCat.2168....0M. Vizier catalog entry
  5. ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv: 1606.08053 . Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID   119231169.
  6. 1 2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv: 1108.4971 . Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID   119257644. Vizier catalog entry
  7. ↑ Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410 (1): 190–200. arXiv: 1007.4883 . Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x. S2CID   118629873. Vizier catalog entry
  8. 1 2 Wu, Yue; Singh, H. P.; Prugniel, P.; Gupta, R.; Koleva, M. (2010). "Coudé-feed stellar spectral library – atmospheric parameters". Astronomy & Astrophysics. 525: A71. arXiv: 1009.1491 . Bibcode:2011A&A...525A..71W. doi:10.1051/0004-6361/201015014. S2CID   53480665.
  9. ↑ Hohle, M.M.; Neuhäuser, R.; Schutz, B.F. (2010). "Masses and luminosities of O- and B-type stars and red supergiants". Astronomische Nachrichten. 331 (4): 349. arXiv: 1003.2335 . Bibcode:2010AN....331..349H. doi:10.1002/asna.200911355. S2CID   111387483. Vizier catalog entry
  10. ↑ Abt, Helmut A.; Levato, Hugo; Grosso, Monica (2002). "Rotational Velocities of B Stars". The Astrophysical Journal. 573 (1): 359–365. Bibcode:2002ApJ...573..359A. doi: 10.1086/340590 .
  11. 1 2 Pavlovski, K.; Bozic, H.; Harmanec, P.; Horn, J.; Koubsky, P. (14 November 1983). "Sudden Brightening of the Recently Discovered Be Star HR 7739". Information Bulletin on Variable Stars. 2431 (1): 1. Bibcode:1983IBVS.2431....1P. ISSN   0374-0676.
  12. ↑ Lefèvre, L.; Marchenko, S. V.; Moffat, A. F. J.; Acker, A. (November 2009). "A systematic study of variability among OB-stars based on HIPPARCOS photometry". Astronomy and Astrophysics. 507 (2): 1141–1201. Bibcode:2009A&A...507.1141L. doi: 10.1051/0004-6361/200912304 .
  13. ↑ Green, Daniel W. E. (July 14, 1982). "2 Vul AND HR 7739". IAU Circular. IAU Central Bureau for Astronomical Telegrams. 3710. Retrieved 11 December 2012.
  14. ↑ Cote, J. (July 1987). "B and A type stars with unexpectedly large colour excesses at IRAS wavelengths". Astronomy and Astrophysics . 181 (1): 83. Bibcode:1987A&A...181...77C. ISSN   0004-6361.
  15. ↑ Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869. arXiv: 0806.2878 . Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID   14878976. Vizier catalog entry
  16. ↑ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi: 10.1086/323920 . Vizier catalog entry
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