Astronomy:Stein 2051
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Short description: Star in the constellation Camelopardalis
Coordinates: 
04h 31m 11.52059s, +58° 58′ 37.4806″
 Image of Stein 2051 B and a background star taken by the Hubble Space Telescope.[1] Credit: NASA, ESA, and K. Sahu (STScI) | |
| Observation data {{#ifeq:J2000|J2000.0 (ICRS)|Epoch J2000.0 Equinox J2000.0 (ICRS)| [[History:Epoch|Epoch J2000]] [[Astronomy:Equinox (celestial coordinates)|Equinox J2000}} | |
|---|---|
| Constellation | Camelopardalis |
| Stein 2051 A | |
| Right ascension | 04h 31m 11.5181s[2] |
| Declination | +58° 58′ 37.461″[2] |
| Apparent magnitude (V) | 10.977[2] |
| Stein 2051 B | |
| Right ascension | 04h 31m 12.570s[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 (Rv) | 29 km/s |
| Proper motion (μ) | RA: 1300.365[5] mas/yr Dec.: -2046.106[5] mas/yr |
| Parallax (π) | 181.2438 ± 0.0499[5] 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[6] mas/yr Dec.: −1947.638±0.019[6] mas/yr |
| Parallax (π) | 181.2730 ± 0.0203[6] mas |
| 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 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 | |
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 this 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". https://www.spacetelescope.org/images/potw1724a/.
- ↑ 2.0 2.1 2.2 2.3 2.4 "NAME Stein 2051 A". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NAME+Stein+2051+A.
- ↑ 3.0 3.1 3.2 3.3 3.4 "NAME Stein 2051 B". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NAME+Stein+2051+B.
- ↑ 4.0 4.1 4.2 4.3 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. doi:10.1086/128321. Bibcode: 1966PASP...78..171H.
- ↑ 5.0 5.1 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ 6.0 6.1 6.2 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. 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. et al. (2020), "The CARMENES search for exoplanets around M dwarfs", Astronomy & Astrophysics 642: A22, doi:10.1051/0004-6361/202038787
- ↑ 8.0 8.1 8.2 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, doi:10.1093/mnras/staa427, Bibcode: 2020MNRAS.493.4533K
- ↑ 9.0 9.1 9.2 9.3 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, doi:10.1126/science.aal2879, PMID 28592430, Bibcode: 2017Sci...356.1046S.
- ↑ Perryman (1997). "HIP 21088". The Hipparcos and Tycho Catalogues. http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-source=I/239/hip_main&HIP=21088.
- ↑ "Gl 169.1". Preliminary Version of the Third Catalogue of Nearby Stars. 1991. http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-source=V/70A&Name=Gl%20169.1.
- ↑ 12.0 12.1 "GCTP 986.01". The General Catalogue of Trigonometric Stellar Parallaxes. 1995. http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-source=I/238A/picat&GCTP=986.01.
- ↑ Perryman (1997). "HIP 19849". The Hipparcos and Tycho Catalogues. http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-source=I/239/hip_main&HIP=19849.
External links
- "CCDM J04312+5858AB -- Double or multiple star". Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-id?Ident=CCDM%20J04312%2B5858AB. (the whole system)
- "NAME STEIN 2051A -- Star in double system". Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-id?Ident=%40270532&Name=NAME%20STEIN%202051A. (component A)
- "GJ 169.1 B -- Star in double system". Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-id?Ident=%40270627&Name=GJ%20%20%20169.1%20B. (component B)
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