Alpha Volantis

α Volantis
Location of α Volantis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Volans
Right ascension 09h 02m 26.79592s[1]
Declination −66° 23′ 45.8727″[1]
Apparent magnitude (V) +4.00[2]
Characteristics
Spectral type kA3hA5mA5 V[3]
U−B color index +0.13[2]
B−V color index +0.14[2]
Astrometry
Radial velocity (Rv)+4.9[4] km/s
Proper motion (μ) RA: −2.00[1] mas/yr
Dec.: +95.51[1] mas/yr
Parallax (π)26.11 ± 0.12 mas[1]
Distance124.9 ± 0.6 ly
(38.3 ± 0.2 pc)
Absolute magnitude (MV)+1.60[5]
Orbit[6]
Period (P)0.652 ± 0.001 yr
Semi-major axis (a)0.0321 ± 0.0013″
Eccentricity (e)0.041 ± 0.038
Inclination (i)101.9 ± 2.3°
Longitude of the node (Ω)105.3 ± 1.4°
Periastron epoch (T)2015.593 ± 0.063
Argument of periastron (ω)
(secondary)		248.5 ± 34.2°
Details
Mass1.87[7] M☉
Radius1.9[8] R☉
Surface gravity (log g)4.09[3] cgs
Temperature8,198[3] K
Metallicity [Fe/H]+0.19[3] dex
Rotational velocity (v sin i)30.6±0.4[9] km/s
Age427+183
−377[10] Myr
Other designations
CPD−65°1065, FK5 343, GJ 333.3, HD 78045, HIP 44382, HR 3615, SAO 250422.[11]
Database references
SIMBADdata

Alpha Volantis (Alpha Vol), Latinized from α Volantis, is a binary star[12] system located in the southern constellation Volans. It has an apparent visual magnitude of +4.00, which is bright enough to be seen with the naked eye. Based upon parallax measurements made with the Hipparcos spacecraft, it is located at a distance of 125 light years from the Sun. As of 2010, the two components of this system had an angular separation of 0.0318″ along a position angle of 286.9°. The magnitude difference between the two components is 0.1.[13] It is considered a member of the Sirius supercluster.[5]

The primary component is an Am star with a stellar classification of kA3hA5mA5 V.[3] This notation indicates the star has the weak calcium II K-line of an A3 star, and the hydrogen and metallic lines of an A5 star.[14] It has an estimated age of 427 million years.[10] In 1992, it was found to be emitting an infrared excess, suggesting the presence of a circumstellar disk of dust.[15] However, subsequent observations have not confirmed this.[16]

  1. ^ a b c d e Cite error: The named reference van Leeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference Mermilliod1986 was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference aj132_1_161 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Wielen1999 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Eggen1998 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Tokovinin2019 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference David2015 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Cadars2001 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Diaz2011 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference apj546_1_352 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Hartkopf2012 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Gray2009 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Cheng1992 was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference Gaspar2013 was invoked but never defined (see the help page).