25+vulpeculae Latitude and Longitude:

Sky map 20h 22m 03.4s, +24° 26′ 46″
From Wikipedia, the free encyclopedia
25 Vulpeculae
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Vulpecula
Right ascension 20h 22m 03.43076s [1]
Declination +24° 26′ 45.9526″ [1]
Apparent magnitude (V) 5.50 [2]
Characteristics
Spectral type B6 IVe [3] [4]
B−V color index −0.09±0.02 [4]
Astrometry
Radial velocity (Rv)−11.0±3.6 [5] km/s
Proper motion (μ) RA: +0.605 [1]  mas/ yr
Dec.: −5.732 [1]  mas/ yr
Parallax (π)2.7932 ± 0.1493  mas [1]
Distance1,170 ± 60  ly
(360 ± 20  pc)
Absolute magnitude (MV)−1.88 [4]
Details
Mass7±1 [6]  M
Radius11±1 [6]  R
Luminosity (bolometric)1,345+215
−184
[7]  L
Surface gravity (log g)3.52±0.21 [7]  cgs
Temperature13,170±330 [7]  K
Rotational velocity (v sin i)160±14 [7] km/s
Other designations
25 Vul, BD+23°3986, HD 193911, HIP 100435, HR 7789, SAO 88580 [8]
Database references
SIMBAD data

25 Vulpeculae is a single [2] star in the northern constellation of Vulpecula, located roughly 1,170  light years away from the Sun. It is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude of 5.50 [2] This object is moving closer to the Earth with a heliocentric radial velocity of −11 km/s. [5]

This is a Be star with a stellar classification of B6 IVe, [3] matching the spectrum of an aging subgiant with a circumstellar disk of ionized gas. Cowley (1972) had it rated as a more evolved giant star with a class of B8 IIIn, [9] where the 'n' notation indicates "nebulous" lines due to rapid rotation. It has a high rate of spin, showing a projected rotational velocity of 160 km/s. [7] The star has 7 times the mass of the Sun and 11 times the Sun's radius. [6] It is radiating 1,345 times the luminosity of the Sun from its photosphere at an effective temperature of 13,170 K. [7]

References

  1. ^ a b c d e 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.
  2. ^ a b c Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv: 0806.2878, Bibcode: 2008MNRAS.389..869E, doi: 10.1111/j.1365-2966.2008.13596.x, S2CID  14878976.
  3. ^ a b Slettebak, A. (1982), "Spectral types and rotational velocities of the brighter Be stars and A-F type shell stars", Astrophysical Journal Supplement Series, 50: 55–83, Bibcode: 1982ApJS...50...55S, doi: 10.1086/190820.
  4. ^ a b c 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.
  5. ^ a b Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 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. ^ a b c Vieira, R. G.; et al. (January 2017), "The life cycles of Be viscous decretion discs: time-dependent modelling of infrared continuum observations", Monthly Notices of the Royal Astronomical Society, 464 (3): 3071–3089, arXiv: 1707.02861, Bibcode: 2017MNRAS.464.3071V, doi: 10.1093/mnras/stw2542.
  7. ^ a b c d e f Zorec, J.; et al. (November 2016), "Critical study of the distribution of rotational velocities of Be stars. I. Deconvolution methods, effects due to gravity darkening, macroturbulence, and binarity", Astronomy & Astrophysics, 595: 26, Bibcode: 2016A&A...595A.132Z, doi: 10.1051/0004-6361/201628760, hdl: 11336/37946.
  8. ^ "25 Vulpeculae". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-03-16.
  9. ^ Cowley, A. (November 1972), "Spectral classification of the bright B8 stars", Astronomical Journal, 77: 750–755, Bibcode: 1972AJ.....77..750C, doi: 10.1086/111348.



25+vulpeculae Latitude and Longitude:

Sky map 20h 22m 03.4s, +24° 26′ 46″
From Wikipedia, the free encyclopedia
25 Vulpeculae
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Vulpecula
Right ascension 20h 22m 03.43076s [1]
Declination +24° 26′ 45.9526″ [1]
Apparent magnitude (V) 5.50 [2]
Characteristics
Spectral type B6 IVe [3] [4]
B−V color index −0.09±0.02 [4]
Astrometry
Radial velocity (Rv)−11.0±3.6 [5] km/s
Proper motion (μ) RA: +0.605 [1]  mas/ yr
Dec.: −5.732 [1]  mas/ yr
Parallax (π)2.7932 ± 0.1493  mas [1]
Distance1,170 ± 60  ly
(360 ± 20  pc)
Absolute magnitude (MV)−1.88 [4]
Details
Mass7±1 [6]  M
Radius11±1 [6]  R
Luminosity (bolometric)1,345+215
−184
[7]  L
Surface gravity (log g)3.52±0.21 [7]  cgs
Temperature13,170±330 [7]  K
Rotational velocity (v sin i)160±14 [7] km/s
Other designations
25 Vul, BD+23°3986, HD 193911, HIP 100435, HR 7789, SAO 88580 [8]
Database references
SIMBAD data

25 Vulpeculae is a single [2] star in the northern constellation of Vulpecula, located roughly 1,170  light years away from the Sun. It is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude of 5.50 [2] This object is moving closer to the Earth with a heliocentric radial velocity of −11 km/s. [5]

This is a Be star with a stellar classification of B6 IVe, [3] matching the spectrum of an aging subgiant with a circumstellar disk of ionized gas. Cowley (1972) had it rated as a more evolved giant star with a class of B8 IIIn, [9] where the 'n' notation indicates "nebulous" lines due to rapid rotation. It has a high rate of spin, showing a projected rotational velocity of 160 km/s. [7] The star has 7 times the mass of the Sun and 11 times the Sun's radius. [6] It is radiating 1,345 times the luminosity of the Sun from its photosphere at an effective temperature of 13,170 K. [7]

References

  1. ^ a b c d e 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.
  2. ^ a b c Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv: 0806.2878, Bibcode: 2008MNRAS.389..869E, doi: 10.1111/j.1365-2966.2008.13596.x, S2CID  14878976.
  3. ^ a b Slettebak, A. (1982), "Spectral types and rotational velocities of the brighter Be stars and A-F type shell stars", Astrophysical Journal Supplement Series, 50: 55–83, Bibcode: 1982ApJS...50...55S, doi: 10.1086/190820.
  4. ^ a b c 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.
  5. ^ a b Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 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. ^ a b c Vieira, R. G.; et al. (January 2017), "The life cycles of Be viscous decretion discs: time-dependent modelling of infrared continuum observations", Monthly Notices of the Royal Astronomical Society, 464 (3): 3071–3089, arXiv: 1707.02861, Bibcode: 2017MNRAS.464.3071V, doi: 10.1093/mnras/stw2542.
  7. ^ a b c d e f Zorec, J.; et al. (November 2016), "Critical study of the distribution of rotational velocities of Be stars. I. Deconvolution methods, effects due to gravity darkening, macroturbulence, and binarity", Astronomy & Astrophysics, 595: 26, Bibcode: 2016A&A...595A.132Z, doi: 10.1051/0004-6361/201628760, hdl: 11336/37946.
  8. ^ "25 Vulpeculae". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-03-16.
  9. ^ Cowley, A. (November 1972), "Spectral classification of the bright B8 stars", Astronomical Journal, 77: 750–755, Bibcode: 1972AJ.....77..750C, doi: 10.1086/111348.



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