HD 29697

HD 29697 (Gliese 174, V834 Tauri) is a variable star of BY Draconis type in the constellation Taurus. It has an apparent magnitude around 8 and is approximately 43 ly away.

HD 29697
Observation data
Epoch J2000      Equinox J2000
Constellation Taurus
Right ascension  04h 41m 18.85634s[1]
Declination +20° 54′ 05.4456″[1]
Apparent magnitude (V) 7.94 - 8.33[2]
Characteristics
Spectral type K3 V[3]
U−B color index +0.94[4]
B−V color index +1.09[4]
Variable type BY Dra[5]
Astrometry
Radial velocity (Rv)+11[6] km/s
Proper motion (μ) RA: −232.38±1.05[1] mas/yr
Dec.: −254.28±0.69[1] mas/yr
Parallax (π)75.82 ± 1.14[1] mas
Distance43.0 ± 0.6 ly
(13.2 ± 0.2 pc)
Absolute magnitude (MV)+7.49[7]
Details
Mass0.75[8] M☉
Radius0.67[8] R☉
Luminosity0.15[8] L☉
Surface gravity (log g)4.50[5] cgs
Temperature4,454±11.4[9] K
Metallicity [Fe/H]0.01[5] dex
Rotational velocity (v sin i)9.73[5] km/s
Age49±37[8] Myr
Other designations
V834 Tau, BD+20° 802, GJ 174, Gliese 174, HD 29697, HIP 21818, SAO 76708.[10]
Database references
SIMBADdata
ARICNSdata

Description

HD 29697 is the Henry Draper Catalogue number of this star. It is also known by its designation in the Gliese Catalogue of Nearby Stars, Gliese 174, and its variable star designation V834 Tauri.

V834 Tauri is a BY Draconis variable with maximum and minium apparent magnitudes of 7.94 and 8.33 respectively,[2] so it is never visible to the naked eye.

The star has been examined for indications of a circumstellar disk using the Spitzer Space Telescope, but no statistically-significant infrared excess was detected.[8]

gollark: Yes, that is silly people being silly.
gollark: You're not really paying them for either as much as just the fact that they can do/make the thing you want and you are, presumably, willing to pay the price they ask for. Going around trying to judge someone else's "worth" in some way is problematic.
gollark: The learning time is amortized over all the other programming stuff they do, and it's not like they would somehow unlearn everything if you didn't pay more. Still, it is somewhat complicated and, er, possibly impossible, although if people want to do it (they regularly do complex things anyway if they're interesting) then why not.
gollark: Honestly it's not *that* practical a lot of the time because doing complex things is very hard and slow.
gollark: Oh, and reconnaissance, except not really because they have no sensors.

References
  1. 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
  2. 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. Montes, D.; et al. (2001), "Late-type members of young stellar kinematic groups - I. Single stars" (PDF), Monthly Notices of the Royal Astronomical Society, 328 (1): 45–63, arXiv:astro-ph/0106537, Bibcode:2001MNRAS.328...45M, doi:10.1046/j.1365-8711.2001.04781.x
  4. Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M
  5. Mishenina, T. V.; et al. (November 2012), "Activity and the Li abundances in the FGK dwarfs", Astronomy & Astrophysics, 547: 8, arXiv:1210.6843, Bibcode:2012A&A...547A.106M, doi:10.1051/0004-6361/201118412, A106
  6. Evans, D. S. (June 20–24, 1966). "The Revision of the General Catalogue of Radial Velocities". In Batten, Alan Henry; Heard, John Frederick (eds.). Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30. Determination of Radial Velocities and their Applications. 30. University of Toronto: International Astronomical Union. p. 57. Bibcode:1967IAUS...30...57E.
  7. 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.
  8. Plavchan, Peter; et al. (June 2009), "New Debris Disks Around Young, Low-Mass Stars Discovered with the Spitzer Space Telescope", The Astrophysical Journal, 698 (2): 1068–1094, arXiv:0904.0819, Bibcode:2009ApJ...698.1068P, doi:10.1088/0004-637X/698/2/1068
  9. Kovtyukh, V. V.; et al. (2003), "High precision effective temperatures for 181 F-K dwarfs from line-depth ratios", Astronomy and Astrophysics, 411 (3): 559–564, arXiv:astro-ph/0308429, Bibcode:2003A&A...411..559K, doi:10.1051/0004-6361:20031378
  10. "HD 29697". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 6 February 2018.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.