HD 126053

HD 126053

HD 126053 and brown dwarf companion (blue circle) Credit: unWISE & Meli_thev
Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Virgo
Right ascension	14^h 23^m 15.285^s[1]
Declination	+01° 14′ 29.64″[1]
Apparent magnitude (V)	6.25[2]
Characteristics
HD 126053 A
Evolutionary stage	Main sequence
Spectral type	G1 V[3]
U−B color index	+0.09[4]
B−V color index	0.639[2]
HD 126053 B
Evolutionary stage	Brown dwarf
Spectral type	sdT7.5[5]
Astrometry
Radial velocity (Rv)	−19.17±0.06[2] km/s
Proper motion (μ)	RA: 223.531 mas/yr[1] Dec.: −478.275 mas/yr[1]
Parallax (π)	57.2706 ± 0.0375 mas[1]
Distance	56.95 ± 0.04 ly (17.46 ± 0.01 pc)
Details
HD 126053 A
Mass	0.89[6] M☉
Radius	0.93[7] R☉
Luminosity	0.83[6] L☉
Luminosity (bolometric)	0.812[8] L☉
Surface gravity (log g)	4.57[9] cgs
Temperature	5,722[9] K
Metallicity [Fe/H]	−0.28[9] dex
Rotation	22 d[10]
Rotational velocity (v sin i)	3.08[3] km/s
Age	5.490[11] Gyr
HD 126053 B
Mass	0.019-0.047[12] M☉
Radius	0.080-0.099[12] R☉
Temperature	680±55[12] K
Metallicity	−0.35[5]
Other designations
BD+01°2920, GJ 547, HD 126053, HIP 70319, HR 5384, SAO 120424[13]
Database references
SIMBAD	data

HD 126053 is the Henry Draper Catalogue designation for a star in the equatorial constellation of Virgo. It has an apparent magnitude of 6.25,[2] which means it is faintly visible to the naked eye. According to the Bortle scale, it requires dark suburban or rural skies to view. Parallax measurements made by the Hipparcos spacecraft provide an estimated distance of 57 light years to this star.[1] It is drifting closer with a heliocentric radial velocity of −19.2 km/s.[2]

This star is considered a solar analog—meaning that it is photometrically analogous to the Sun.[6] The physical properties of this star are similar to the Sun, although it is metal poor.[12] Like the Sun, it has a magnetic activity cycle. It shares a common proper motion through space with the spectroscopic binary star system HD 122742, and in the past the three may have formed a triple star system. In the Bright Star Catalogue, it was noted as having an infrared excess. This may have been accreted from the HD 122742 system when the three stars were closer to each other.[14]

In 2012, a brown dwarf was discovered orbiting this star at a distance of 2630 AU. This brown dwarf has a low temperature and is a T dwarf, with an estimated spectral type of T8p in the discovery paper. Discrepancies in the Y and K bands, likely due to low metallicity.[12] Later the spectral types of low metallicity brown dwarfs, called subdwarfs, were revisited. This lead to a re-classification of sdT7.5 and a metallicity of [M/H]= −0.35.[5]

References

1. Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
2. Soubiran, C.; et al. (April 2013), "The catalogue of radial velocity standard stars for Gaia. I. Pre-launch release", Astronomy & Astrophysics, 552: 11, arXiv:1302.1905, Bibcode:2013A&A...552A..64S, doi:10.1051/0004-6361/201220927, S2CID 56094559, A64.
3. Martínez-Arnáiz, R.; et al. (September 2010), "Chromospheric activity and rotation of FGK stars in the solar vicinity. An estimation of the radial velocity jitter" (PDF), Astronomy and Astrophysics, 520: A79, arXiv:1002.4391, Bibcode:2010A&A...520A..79M, doi:10.1051/0004-6361/200913725, S2CID 43455849, archived from the original (PDF) on 2017-09-22, retrieved 2018-11-04.
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. Burgasser, Adam J.; Schneider, Adam C.; Meisner, Aaron M.; Caselden, Dan; Hsu, Chih-Chun; Gerasimov, Roman; Aganze, Christian; Softich, Emma; Karpoor, Preethi (2024-11-08). "New Cold Subdwarf Discoveries from Backyard Worlds and a Metallicity Classification System for T Subdwarfs". arXiv:2411.01378 [astro-ph].
6. Do Nascimento, J. D.; et al. (September 2010), "Rotation and lithium abundance of solar-analog stars. Theoretical analysis of observations", Astronomy and Astrophysics, 519: 9, arXiv:1006.3861, Bibcode:2010A&A...519A.101D, doi:10.1051/0004-6361/200811026, S2CID 56098215, A101.
7. Pasinetti Fracassini, L. E.; et al. (2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy & Astrophysics, 367 (2): 521–24, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
8. Eiroa, C.; et al. (July 2013), "DUst around NEarby Stars. The survey observational results", Astronomy & Astrophysics, 555: A11, arXiv:1305.0155, Bibcode:2013A&A...555A..11E, doi:10.1051/0004-6361/201321050, S2CID 377244.
9. 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, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637, S2CID 119476992.
10. Baliunas, S.; Sokoloff, D.; Soon, W. (1996), "Magnetic Field and Rotation in Lower Main-Sequence Stars: an Empirical Time-dependent Magnetic Bode's Relation?", Astrophysical Journal Letters, 457 (2): L99, Bibcode:1996ApJ...457L..99B, doi:10.1086/309891.
11. Vican, Laura (June 2012), "Age Determination for 346 Nearby Stars in the Herschel DEBRIS Survey", The Astronomical Journal, 143 (6): 135, arXiv:1203.1966, Bibcode:2012AJ....143..135V, doi:10.1088/0004-6256/143/6/135, S2CID 118539505.
12. Pinfield, D. J.; et al. (May 2012), "Discovery of the benchmark metal-poor T8 dwarf BD +01° 2920B", Monthly Notices of the Royal Astronomical Society, 422 (3): 1922–1932, arXiv:1201.3243, Bibcode:2012MNRAS.422.1922P, doi:10.1111/j.1365-2966.2012.20549.x, S2CID 6257539.
13. "HD 126053". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2015-11-13.
14. Frisch, P. C. (April 1993), "G-star astropauses - A test for interstellar pressure", Astrophysical Journal, Part 1, 407 (1): 198–206, Bibcode:1993ApJ...407..198F, doi:10.1086/172505.