Astronomy:Alpha Volantis

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Short description: Binary star system in the constellation Volans
α Volantis
Location of α Volantis (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Volans[1]
Right ascension  09h 02m 26.79592s[2]
Declination −66° 23′ 45.8727″[2]
Apparent magnitude (V) +4.00[3]
Characteristics
Evolutionary stage main sequence[4]
Spectral type kA3hA5mA5 V[5]
U−B color index +0.13[3]
B−V color index +0.14[3]
Astrometry
Radial velocity (Rv)+4.9[6] km/s
Proper motion (μ) RA: −2.00[2] mas/yr
Dec.: +95.51[2] mas/yr
Parallax (π)26.11 ± 0.12[2] mas
Distance124.9 ± 0.6 ly
(38.3 ± 0.2 pc)
Absolute magnitude (MV)+1.08[1]
Orbit[7]
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[8] M☉
Radius2.64[9] R☉
Luminosity29[9] L☉
Surface gravity (log g)3.90[9] cgs
Temperature8,198[5] K
Metallicity [Fe/H]+0.19[5] dex
Rotational velocity (v sin i)30.6±0.4[10] km/s
Age427+183
−377[11] Myr
Other designations
CPD−65°1065, FK5 343, GJ 333.3, GJ 9284, HD 78045, HIP 44382, HR 3615, SAO 250422[12]
Database references
SIMBADdata

Alpha Volantis (Alpha Vol), Latinized from α Volantis, is a binary star[13] 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.[14] It is considered a member of the Sirius supercluster.[15]

The primary component is an Am star with a stellar classification of kA3hA5mA5 V.[5] 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.[16] It has an estimated age of 427 million years.[11] In 1992, it was found to be emitting an infrared excess, suggesting the presence of a circumstellar disk of dust.[17] However, subsequent observations have not confirmed this.[18]

References

  1. ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A  XHIP record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V. 
  3. ↑ 3.0 3.1 3.2 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode: 1986EgUBV........0M. 
  4. ↑ Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  5. ↑ 5.0 5.1 5.2 5.3 Gray, R. O. et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal 132 (1): 161–170, doi:10.1086/504637, Bibcode: 2006AJ....132..161G. 
  6. ↑ Wielen, R. et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions", Veröff. Astron. Rechen-Inst. Heidelb (Astronomisches Rechen-Institut Heidelberg) 35 (35): 1, Bibcode: 1999VeARI..35....1W. 
  7. ↑ Tokovinin, Andrei; Mason, Brian D.; Mendez, Rene A.; Horch, Elliott P.; Briceño, Cesar (2019), "Speckle Interferometry at SOAR in 2018", The Astronomical Journal 158 (1): 48, doi:10.3847/1538-3881/ab24e4, Bibcode: 2019AJ....158...48T 
  8. ↑ David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal 804 (2): 146, doi:10.1088/0004-637X/804/2/146, Bibcode: 2015ApJ...804..146D. 
  9. ↑ 9.0 9.1 9.2 Stassun, Keivan G. et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S. 
  10. ↑ Díaz, C. G. et al. (July 2011), "Accurate stellar rotational velocities using the Fourier transform of the cross correlation maximum", Astronomy & Astrophysics 531: A143, doi:10.1051/0004-6361/201016386, Bibcode: 2011A&A...531A.143D. 
  11. ↑ 11.0 11.1 Song, Inseok et al. (February 2001), "Ages of A-Type Vega-like Stars from uvbyβ Photometry", The Astrophysical Journal 546 (1): 352–357, doi:10.1086/318269, Bibcode: 2001ApJ...546..352S. 
  12. ↑ "alf Vol". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=alf+Vol. 
  13. ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E. 
  14. ↑ Hartkopf, William I. et al. (2012), "Speckle Interferometry at SOAR in 2010 and 2011: Measures, Orbits, and Rectilinear Fits", The Astronomical Journal 143 (2): 19, doi:10.1088/0004-6256/143/2/42, 42, Bibcode: 2012AJ....143...42H, https://apps.dtic.mil/sti/pdfs/ADA556130.pdf. 
  15. ↑ Eggen, Olin J. (August 1998), "The Sirius Supercluster and Missing Mass near the Sun", The Astronomical Journal 116 (2): 782–788, doi:10.1086/300465, Bibcode: 1998AJ....116..782E. 
  16. ↑ Gray, Richard O.; Corbally, Christopher J. (2009), Stellar Spectral Classification, Princeton, New Jersey: Princeton University Press, p. 309, ISBN 978-0-691-12511-4. 
  17. ↑ Cheng, K.-P. et al. (September 1992), "Newly identified main-sequence A stars with circumstellar dust", Astrophysical Journal, Part 2 396 (2): L83–L86, doi:10.1086/186522, Bibcode: 1992ApJ...396L..83C. 
  18. ↑ Gáspár, András et al. (May 2013), "The Collisional Evolution of Debris Disks", The Astrophysical Journal 768 (1): 29, doi:10.1088/0004-637X/768/1/25, 25, Bibcode: 2013ApJ...768...25G. 



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