Pi2 Columbae

For other stars with this Bayer designation, see π Columbae.
Pi2 Columbae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Columba
Right ascension 06h 07m 52.860s[1]
Declination −42° 09′ 14.55″[1]
Apparent magnitude (V) 5.50[2]
Characteristics
Evolutionary stage main sequence[1]
Spectral type A0 V + A[3]
B−V color index +0.00[2]
Astrometry
Radial velocity (Rv)+31.0±3.7[4] km/s
Proper motion (μ) RA: −10.221 mas/yr[1]
Dec.: −16.956 mas/yr[1]
Parallax (π)12.7569±0.0522 mas[1]
Distance256 ± 1 ly
(78.4 ± 0.3 pc)
Absolute magnitude (MV)+1.17[5]
Details
Mass2.34±0.04[1] M☉
Radius2.23±0.05[1] R☉
Luminosity38.7±0.6[1] L☉
Surface gravity (log g)4.064±0.005[1] cgs
Temperature9,646±46[1] K
Rotational velocity (v sin i)274[6] km/s
Age370±79[1] Myr
Other designations
π2 Col, CD−42°2351, GC 7816, HD 42303, HIP 29064, HR 2181, SAO 217730, WDS J06079-4209AB[7]
Database references
SIMBADdata

Pi2 Columbae is a multiple star system in the southern constellation of Columba, near the southern constellation border with Pictor. Its name is a Bayer designation that is Latinized from π2 Columbae, and abbreviated Pi2 Col or π2 Col. This system is white-hued and dimly visible to the naked eye as a point of light with a combined apparent visual magnitude of 5.50.[2] Based upon an annual parallax shift of 12.76 mas as seen from Earth,[1] this system is located about 256 ly (78 pc) from the Sun. They are receding with a heliocentric radial velocity of +31 km/s.[4]

The primary star is an A-type main-sequence star of spectral class A0 V,[3] an estimated 370 million years old[1] and spinning rapidly with a projected rotational velocity of 274 km/s.[6] It has 2.34 times the mass of the Sun and 2.23 times the Sun's radius.[1] The star is radiating 38.7 times the luminosity of the Sun from its photosphere at an effective temperature of 9,646 K.[1]

The system is a source of X-ray emission with a luminosity of 184.3×1020 W, which is considered unusual since A-type stars are not expected to display magnetic activity.[3] An A-class companion has been reported at an angular separation of 0.1 arc seconds.[8] The existence of this star has been disputed by other authors.[9]

There are additional possible companions: a 15th-magnitude star 6.6″ away; and a 20th-magnitude star 103″ away. These have a common proper motion although they are too far from the primary for any possible orbital motion to be detected. They are estimated to have masses of 0.48 M☉ and 0.12 M☉ respectively.[9]

References

  1. ^ a b c d e f g h i j k l m n o Vallenari, A.; et al. (Gaia collaboration) (2023), "Gaia Data Release 3. Summary of the content and survey properties", Astronomy and Astrophysics, 674: A1, arXiv:2208.00211, Bibcode:2023A&A...674A...1G, doi:10.1051/0004-6361/202243940, S2CID 244398875 Gaia DR3 record for this source at VizieR.
  2. ^ a b c Corben, P. M.; Stoy, R. H. (1968), "Photoelectric Magnitudes and Colours for Bright Southern Stars", Monthly Notes of the Astronomical Society of Southern Africa, 27: 11, Bibcode:1968MNSSA..27...11C.
  3. ^ a b c Schröder, C.; Schmitt, J. H. M. M. (November 2007), "X-ray emission from A-type stars", Astronomy and Astrophysics, 475 (2): 677–684, Bibcode:2007A&A...475..677S, doi:10.1051/0004-6361:20077429.
  4. ^ a b de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
  5. ^ Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters, 38 (11): 694–706, arXiv:1606.09028, Bibcode:2012AstL...38..694G, doi:10.1134/S1063773712110035, S2CID 119108982.
  6. ^ a b 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, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
  7. ^ "pi02 Col". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-08-28.
  8. ^ 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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  9. ^ a b Tokovinin, Andrei (2018). "The Updated Multiple Star Catalog". The Astrophysical Journal Supplement Series. 235 (1): 6. arXiv:1712.04750. Bibcode:2018ApJS..235....6T. doi:10.3847/1538-4365/aaa1a5.

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