Stein 2051

Stein 2051
	; Image of Stein 2051 B and a background star taken by the Hubble Space Telescope.; Credit: NASA, ESA, and K. Sahu (STScI)
Observation data; Epoch J2000 Equinox J2000
Constellation	Camelopardalis
	Stein 2051 A
Right ascension	04h 31m 11.5181s
Declination	+58° 58′ 37.461″
Apparent magnitude (V)	10.977
	Stein 2051 B
Right ascension	04h 31m 12.570s
Declination	+58° 58′ 41.15″
Apparent magnitude (V)	11.19
Characteristics
Stein 2051 A
Spectral type	M4.0Ve
U−B color index	+1.21
B−V color index	+1.65
Stein 2051 B
Spectral type	DC5
U−B color index	-0.53
B−V color index	+0.31
Astrometry
Stein 2051 A
Radial velocity (Rv)	29 km/s
Proper motion (μ)	RA: 1300.365 mas/yr ; Dec.: -2046.106 mas/yr
Parallax (π)	181.2438 ± 0.0499 mas
Distance	17.995 ± 0.005 ly ; (5.517 ± 0.002 pc)
Stein 2051 B
Radial velocity (Rv)	2.0 km/s
Proper motion (μ)	RA: 1334.780±0.021 mas/yr ; Dec.: −1947.638±0.019 mas/yr
Parallax (π)	181.2730 ± 0.0203 mas
Distance	17.993 ± 0.002 ly ; (5.5165 ± 0.0006 pc)
Details
Stein 2051 A
Mass	0.252±0.013 M☉
Radius	0.292±0.031 R☉
Luminosity	0.0081 L☉
Surface gravity (log g)	4.80+0.13; −0.10 cgs
Temperature	3277+42; −75 K
Metallicity [Fe/H]	0.26+0.06; −0.22 dex
Rotational velocity (v sin i)	5.2+1.7; −2.7 km/s
Stein 2051 B
Mass	0.675±0.051 M☉
Radius	0.0114±0.0004 R☉
Temperature	7122±181 K
Other designations
	Stein 2051, G 175-34, HIP 21088, WDS J04312+5858AB, GJ 169.1, PLX 986.01
	Stein 2051 A: LHS 26, NLTT 13373, TYC 3744-412-1, 2MASS J04311147+585837, WISE J043113.20+585816.7
	Stein 2051 B: EGGR 180, LHS 27, NLTT 13375, TYC 3744-2062-1, 2MASS J04311201+5858476, WD 0426+58, WD2 0426+585, WD3 0426+588
Database references
SIMBAD	The system
	A
	B
	Stein 2051 Location of Stein 2051 in the constellation Camelopardalis;

Stein 2051 (Gliese 169.1, G 175-034, LHS 26/27) is a nearby binary star system, containing a red dwarf (component A) and a degenerate star (white dwarf) (component B), located in constellation Camelopardalis at about 18 ly from Earth.^[12]

Stein 2051 is the nearest (red dwarf + white dwarf) separate binary system (40 Eridani BC is located closer at 16.26 light-years,^[13] but it is a part of a triple star system).

Stein 2051 B is the 6th nearest white dwarf after Sirius B, Procyon B, van Maanen's star, LP 145-141 and 40 Eridani B.

Properties

The brighter of these two stars is A (a red dwarf), but the more massive is component B (a white dwarf).

In 2017, Stein 2051 B was observed passing in front of a more distant star. The bending of starlight by the gravitational field of the nearer star allowed its mass to be directly measured. The estimated mass of Stein 2051 B is 0.675±0.051 M_☉, which fits the expected range of a white dwarf with a carbon-oxygen core.^[9]

References

^ "Einstein revisited". www.spacetelescope.org. Retrieved 12 June 2017.
^ ^a ^b ^c ^d ^e "NAME Stein 2051 A". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 26 December 2016.
^ ^a ^b ^c ^d ^e "NAME Stein 2051 B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 20 December 2016.
^ ^a ^b ^c ^d Hardie, R. H. (1966). "UBV Photometry of the Lowell Proper Motion Object G175-34". Publications of the Astronomical Society of the Pacific. 78 (462): 171. Bibcode:1966PASP...78..171H. doi:10.1086/128321.
^ ^a ^b 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.
^ ^a ^b ^c 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.
^ Passegger, V. M.; Bello-García, A.; Ordieres-Meré, J.; Caballero, J. A.; Schweitzer, A.; González-Marcos, A.; Ribas, I.; Reiners, A.; Quirrenbach, A.; Amado, P. J.; Azzaro, M.; Bauer, F. F.; Béjar, V. J. S.; Cortés-Contreras, M.; Dreizler, S.; Hatzes, A. P.; Henning, Th.; Jeffers, S. V.; Kaminski, A.; Kürster, M.; Lafarga, M.; Marfil, E.; Montes, D.; Morales, J. C.; Nagel, E.; Sarro, L. M.; Solano, E.; Tabernero, H. M.; Zechmeister, M. (2020), "The CARMENES search for exoplanets around M dwarfs", Astronomy & Astrophysics, 642: A22, arXiv:2008.01186, Bibcode:2020A&A...642A..22P, doi:10.1051/0004-6361/202038787
^ ^a ^b ^c Ghosh, Samrat; Ghosh, Supriyo; Das, Ramkrishna; Mondal, Soumen; Khata, Dhrimadri (2020), "Understanding the physical properties of young M dwarfs: NIR spectroscopic studies", Monthly Notices of the Royal Astronomical Society, 493 (3): 4533–4550, arXiv:2002.05762, Bibcode:2020MNRAS.493.4533K, doi:10.1093/mnras/staa427
^ ^a ^b ^c ^d Sahu, Kailash C.; et al. (June 2017), "Relativistic deflection of background starlight measures the mass of a nearby white dwarf star", Science, 356 (6342): 1046–1050, arXiv:1706.02037, Bibcode:2017Sci...356.1046S, doi:10.1126/science.aal2879, PMID 28592430, S2CID 206654918.
^ Perryman; et al. (1997). "HIP 21088". The Hipparcos and Tycho Catalogues. Retrieved 2014-11-23.
^ Gliese, W. & Jahreiß, H. (1991). "Gl 169.1". Preliminary Version of the Third Catalogue of Nearby Stars. Retrieved 2014-11-23.
^ ^a ^b Van Altena W. F.; Lee J. T.; Hoffleit E. D. (1995). "GCTP 986.01". The General Catalogue of Trigonometric Stellar Parallaxes (Fourth ed.). Retrieved 2014-11-23.
^ Perryman; et al. (1997). "HIP 19849". The Hipparcos and Tycho Catalogues. Retrieved 2014-11-21.

External links

"CCDM J04312+5858AB -- Double or multiple star". Centre de Données astronomiques de Strasbourg. Retrieved 2012-01-02. (the whole system)
"NAME STEIN 2051A -- Star in double system". Centre de Données astronomiques de Strasbourg. Retrieved 2012-01-02. (component A)
"GJ 169.1 B -- Star in double system". Centre de Données astronomiques de Strasbourg. Retrieved 2012-01-02. (component B)

This binary or multiple star system–related article is a stub. You can help Wikipedia by expanding it.

This article about a red dwarf is a stub. You can help Wikipedia by expanding it.

This article about a white dwarf is a stub. You can help Wikipedia by expanding it.

[1] "Einstein revisited". www.spacetelescope.org. Retrieved 12 June 2017.

[compA-2] "NAME Stein 2051 A". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 26 December 2016.

[compB-3] "NAME Stein 2051 B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 20 December 2016.

[UBV-4] Hardie, R. H. (1966). "UBV Photometry of the Lowell Proper Motion Object G175-34". Publications of the Astronomical Society of the Pacific. 78 (462): 171. Bibcode:1966PASP...78..171H. doi:10.1086/128321.

[EDR3a-5] 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.

[EDR3b-6] 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.

[7] Passegger, V. M.; Bello-García, A.; Ordieres-Meré, J.; Caballero, J. A.; Schweitzer, A.; González-Marcos, A.; Ribas, I.; Reiners, A.; Quirrenbach, A.; Amado, P. J.; Azzaro, M.; Bauer, F. F.; Béjar, V. J. S.; Cortés-Contreras, M.; Dreizler, S.; Hatzes, A. P.; Henning, Th.; Jeffers, S. V.; Kaminski, A.; Kürster, M.; Lafarga, M.; Marfil, E.; Montes, D.; Morales, J. C.; Nagel, E.; Sarro, L. M.; Solano, E.; Tabernero, H. M.; Zechmeister, M. (2020), "The CARMENES search for exoplanets around M dwarfs", Astronomy & Astrophysics, 642: A22, arXiv:2008.01186, Bibcode:2020A&A...642A..22P, doi:10.1051/0004-6361/202038787

[Khata2020-8] Ghosh, Samrat; Ghosh, Supriyo; Das, Ramkrishna; Mondal, Soumen; Khata, Dhrimadri (2020), "Understanding the physical properties of young M dwarfs: NIR spectroscopic studies", Monthly Notices of the Royal Astronomical Society, 493 (3): 4533–4550, arXiv:2002.05762, Bibcode:2020MNRAS.493.4533K, doi:10.1093/mnras/staa427

[Sahu2017-9] Sahu, Kailash C.; et al. (June 2017), "Relativistic deflection of background starlight measures the mass of a nearby white dwarf star", Science, 356 (6342): 1046–1050, arXiv:1706.02037, Bibcode:2017Sci...356.1046S, doi:10.1126/science.aal2879, PMID 28592430, S2CID 206654918.

[van_Leeuwen2007-10] Perryman; et al. (1997). "HIP 21088". The Hipparcos and Tycho Catalogues. Retrieved 2014-11-23.

[Gliese1991-11] Gliese, W. & Jahreiß, H. (1991). "Gl 169.1". Preliminary Version of the Third Catalogue of Nearby Stars. Retrieved 2014-11-23.

[van_Altena1995-12] Van Altena W. F.; Lee J. T.; Hoffleit E. D. (1995). "GCTP 986.01". The General Catalogue of Trigonometric Stellar Parallaxes (Fourth ed.). Retrieved 2014-11-23.

[van_Leeuwen2007_40_Eri-13] Perryman; et al. (1997). "HIP 19849". The Hipparcos and Tycho Catalogues. Retrieved 2014-11-21.

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Observation data Epoch J2000 Equinox J2000
Image of Stein 2051 B and a background star taken by the Hubble Space Telescope.^[1] Credit: NASA, ESA, and K. Sahu (STScI)
Constellation	Camelopardalis
Stein 2051 A
Right ascension	04^h 31^m 11.5181^s^[2]
Declination	+58° 58′ 37.461″^[2]
Apparent magnitude (V)	10.977^[2]
Stein 2051 B
Right ascension	04^h 31^m 12.570^s^[3]
Declination	+58° 58′ 41.15″^[3]
Apparent magnitude (V)	11.19^[3]
Characteristics
Stein 2051 A
Spectral type	M4.0Ve^[2]
U−B color index	+1.21^[4]
B−V color index	+1.65^[4]
Stein 2051 B
Spectral type	DC5^[3]
U−B color index	-0.53^[4]
B−V color index	+0.31^[4]
Astrometry
Stein 2051 A
Radial velocity (R_v)	29 km/s
Proper motion (μ)	RA: 1300.365 mas/yr^[5] Dec.: -2046.106 mas/yr^[5]
Parallax (π)	181.2438 ± 0.0499 mas^[5]
Distance	17.995 ± 0.005 ly (5.517 ± 0.002 pc)
Stein 2051 B
Radial velocity (R_v)	2.0 km/s
Proper motion (μ)	RA: 1334.780±0.021^[6] mas/yr Dec.: −1947.638±0.019^[6] mas/yr
Parallax (π)	181.2730 ± 0.0203 mas^[6]
Distance	17.993 ± 0.002 ly (5.5165 ± 0.0006 pc)
Details^[7]
Stein 2051 A
Mass	0.252±0.013^[8] `M`_☉
Radius	0.292±0.031^[8] `R`_☉
Luminosity	0.0081^[8] `L`_☉
Surface gravity (log g)	4.80^+0.13 _−0.10 cgs
Temperature	3277⁺⁴² ₋₇₅ K
Metallicity [Fe/H]	0.26^+0.06 _−0.22 dex
Rotational velocity (v sin i)	5.2^+1.7 _−2.7 km/s
Stein 2051 B
Mass	0.675±0.051^[9] `M`_☉
Radius	0.0114±0.0004^[9] `R`_☉
Temperature	7122±181^[9] K
Other designations
Stein 2051, G 175-34, HIP 21088,^[10] WDS J04312+5858AB, GJ 169.1,^[11] PLX 986.01^[12]
Stein 2051 A: LHS 26, NLTT 13373, TYC 3744-412-1, 2MASS J04311147+585837, WISE J043113.20+585816.7^[2]
Stein 2051 B: EGGR 180, LHS 27, NLTT 13375, TYC 3744-2062-1, 2MASS J04311201+5858476, WD 0426+58, WD2 0426+585, WD3 0426+588^[3]
Database references
SIMBAD	The system
	A
	B
Stein 2051 Location of Stein 2051 in the constellation Camelopardalis