HD 196775

Last updated
HD 196775
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Delphinus
Right ascension 20h 39m 04.9681s [1]
Declination +15° 50′ 17.5112″ [1]
Apparent magnitude  (V)5.98 [2]
Characteristics
Spectral type B3 V [3]
U−B color index −0.71 [2]
B−V color index −0.16 [2]
Astrometry
Radial velocity (Rv)−4.6±1 [4]  km/s
Proper motion (μ)RA: −0.868  mas/yr [1]
Dec.: −15.290  mas/yr [1]
Parallax (π)3.1211 ± 0.0617  mas [1]
Distance 1,050 ± 20  ly
(320 ± 6  pc)
Absolute magnitude  (MV)−2.05 [5]
Details
Mass 7±0.4 [6]   M☉
Radius 4.13±0.14 [7]   R☉
Luminosity 1,507 [8]   L☉
Surface gravity (log g)3.97 [9]   cgs
Temperature 18,100 [9]   K
Rotational velocity (v sin i)145±6 [10]  km/s
Age 36.1±9.5 [6]   Myr
Other designations
AG+15°2265, BD+15°4220, GC  28785, HD  196775, HIP  101909, HR  7899, SAO  106347, WDS J20391+1550A
Database references
SIMBAD data

HD 196775 (HR 7899) is a solitary star in the equatorial constellation Delphinus. It has an apparent magnitude of 5.98, allowing it to be faintly seen with the naked eye. The object is relatively far at a distance of 1,050 light years but is approaching the Solar System with a heliocentric radial velocity of −4.6  km/s . HD 196775 has a high peculiar velocity of 21.8+1.9
−4.1  km/s [6] compared to neighboring stars, indicating that it may be a runaway star.

HD 196775 has a general stellar classification of B3 V, [3] indicating that it is an ordinary B-type main-sequence star. However, once source gives it a class of B4 Vn, [11] making it slightly cooler and having broad absorption lines due to rapid rotation. It has an angular diameter of 0.12  mas , [12] yielding a radius 4.13 times that of the Sun. [7] At present it has 7 times the mass of the Sun [6] and shines at 1507  L☉ [8] from its photosphere at an effective temperature of 18,100  K , [9] giving it a whitish blue hue. HD 196775 is 36 million years old [6] and is spinning rapidly with a projected rotational velocity of 145  km/s . [10]

HD 196775 has four faint optical companions whose parameters are listed below.

HD 196775's Companions [13]
Companionmv PA (°)YearSep. (″)
B12.4015420065.2
C11.31122201239.9
D14.40146201228.8
E14.4033201223.3

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References

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  3. 1 2 Cucchiaro, A.; Jaschek, M.; Jaschek, C.; Macau-Hercot, D. (May 1980). "Spectral classification from the ultraviolet line features of S2/68 spectra". Astronomy and Astrophysics Supplement Series. 40: 207–213. Bibcode:1980A&AS...40..207C. ISSN   0365-0138.
  4. ↑ Gontcharov, G. A. (November 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. ISSN   1063-7737. S2CID   119231169.
  5. ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv: 1108.4971 . Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. ISSN   1063-7737. S2CID   255204555.
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  7. 1 2 Lang, Kenneth R. (2006). Astrophysical formulae. Astronomy and astrophysics library. Vol. 1 (3 ed.). Birkhäuser. ISBN   3-540-29692-1.. The radius (R*) is given by:
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  9. 1 2 3 Lyubimkov, L. S.; Rostopchin, S. I.; Lambert, D. L. (21 June 2004). "Surface abundances of light elements for a large sample of early B-type stars – III. An analysis of helium lines in spectra of 102 stars". Monthly Notices of the Royal Astronomical Society. 351 (2): 745–767. Bibcode:2004MNRAS.351..745L. doi: 10.1111/j.1365-2966.2004.07825.x . eISSN   1365-2966. ISSN   0035-8711.
  10. 1 2 Bragança, G. A.; Daflon, S.; Cunha, K.; Bensby, T.; Oey, M. S.; Walth, G. (October 1, 2012). "Projected Rotational Velocities and Stellar Characterization of 350 B Stars in the Nearby Galactic Disk". The Astronomical Journal. American Astronomical Society. 144 (5): 130. arXiv: 1208.1674 . Bibcode:2012AJ....144..130B. doi: 10.1088/0004-6256/144/5/130 . ISSN   0004-6256.
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