Astronomy:Stein 2051

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Short description: Star in the constellation Camelopardalis

Coordinates: Sky map 04h 31m 11.52059s, +58° 58′ 37.4806″

Stein 2051
350px
Annotated Hubble Space Telescope image of the Stein 2051 components and a background star ("source") used to measure the bending of starlight
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[1]
Stein 2051 A
Right ascension  04h 31m 11.5144s[2]
Declination +58° 58′ 37.464″[2]
Apparent magnitude (V) 10.98[3]
Stein 2051 B
Right ascension  04h 31m 12.5714s[4]
Declination +58° 58′ 41.293″[4]
Apparent magnitude (V) 12.43[5]
Characteristics
Stein 2051 A
Evolutionary stage main sequence[6]
Spectral type M4.0Ve[7]
U−B color index +1.21[8]
B−V color index +1.65[8]
Stein 2051 B
Evolutionary stage white dwarf[9]
Spectral type DC5[10]
U−B color index -0.53[8]
B−V color index +0.31[8]
Astrometry
Stein 2051 A
Radial velocity (Rv)+29[11] km/s
Proper motion (μ) RA: +1,300.365[2] mas/yr
Dec.: −2,046.106[2] mas/yr
Parallax (π)181.2438 ± 0.0499[2] mas
Distance17.995 ± 0.005 ly
(5.517 ± 0.002 pc)
Absolute magnitude (MV)+12.36[12]
Stein 2051 B
Radial velocity (Rv)+2.0[13] km/s
Proper motion (μ) RA: +1,334.780±0.021[4] mas/yr
Dec.: −1,947.638±0.019[4] mas/yr
Parallax (π)181.2730 ± 0.0203[4] mas
Distance17.993 ± 0.002 ly
(5.5165 ± 0.0006 pc)
Absolute magnitude (MV)+13.71[14]
Details[6]
Stein 2051 A
Mass0.252±0.013[15] M☉
Radius0.292±0.031[15] R☉
Luminosity0.0081[15] L☉
Surface gravity (log g)4.80+0.13−0.10 cgs
Temperature3277+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
Age1.9 - 3.6 [9] Gyr
Stein 2051 B
Mass0.675±0.051[9] M☉
Radius0.0114±0.0004[9] R☉
Luminosity0.00003[lower-alpha 1] L☉
Surface gravity (log g)8.153[lower-alpha 2] cgs
Temperature7122±181[9] K
Age1.9±0.4 (cooling age)[9] Gyr
Other designations
Stein 2051, G 175-34, HIP 21088,[16] WDS J04312+5858AB, GJ 169.1,[17] PLX 986.01[18]
Stein 2051 A: LHS 26, NLTT 13373, TYC 3744-412-1, 2MASS J04311147+585837, WISE J043113.20+585816.7[19]
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[20]
Database references
SIMBADA
B
Stein 2051 is located in the constellation Camelopardalis
Stein 2051 is located in the constellation Camelopardalis
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.[18]

Stein 2051 is the nearest (red dwarf + white dwarf) separate binary system (40 Eridani BC is located closer at 16.26 light-years,[21] 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]

Notes

  1. ↑ Derived from the temperature and radius
  2. ↑ Derived from the mass and radius

References

  1. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific 99 (617): 695. doi:10.1086/132034. Bibcode: 1987PASP...99..695R  Constellation record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 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.
  3. ↑ Zacharias, N.; Finch, C. T.; Girard, T. M.; Henden, A.; Bartlett, J. L.; Monet, D. G.; Zacharias, M. I. (2012). "VizieR Online Data Catalog: UCAC4 Catalogue (Zacharias+, 2012)". Vizier Online Data Catalog. Bibcode: 2012yCat.1322....0Z. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 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. ↑ Holberg, J. B.; Oswalt, T. D.; Sion, E. M.; McCook, G. P. (2016). "The 25 parsec local white dwarf population". Monthly Notices of the Royal Astronomical Society 462 (3): 2295. doi:10.1093/mnras/stw1357. Bibcode: 2016MNRAS.462.2295H. 
  6. ↑ 6.0 6.1 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. Bibcode: 2020A&A...642A..22P. 
  7. ↑ Lépine, Sébastien; Hilton, Eric J.; Mann, Andrew W.; Wilde, Matthew; Rojas-Ayala, Bárbara; Cruz, Kelle L.; Gaidos, Eric (2013). "A Spectroscopic Catalog of the Brightest (J < 9) M Dwarfs in the Northern Sky". The Astronomical Journal 145 (4): 102. doi:10.1088/0004-6256/145/4/102. Bibcode: 2013AJ....145..102L. 
  8. ↑ 8.0 8.1 8.2 8.3 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. 
  9. ↑ 9.0 9.1 9.2 9.3 9.4 9.5 9.6 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. 
  10. ↑ Greenstein, J. L. (1984). "Spectrophotometry of the white dwarfs". The Astrophysical Journal 276: 602. doi:10.1086/161649. Bibcode: 1984ApJ...276..602G. 
  11. ↑ Fouqué, Pascal; Moutou, Claire; Malo, Lison; Martioli, Eder; Lim, Olivia; Rajpurohit, Arvind; Artigau, Etienne; Delfosse, Xavier et al. (2018). "SPIRou Input Catalogue: Global properties of 440 M dwarfs observed with ESPaDOnS at CFHT". Monthly Notices of the Royal Astronomical Society 475 (2): 1960. doi:10.1093/mnras/stx3246. Bibcode: 2018MNRAS.475.1960F. 
  12. ↑ Houdebine, Éric R.; Mullan, D. J.; Doyle, J. G.; de la Vieuville, Geoffroy; Butler, C. J.; Paletou, F. (2019). "The Mass-Activity Relationships in M and K Dwarfs. I. Stellar Parameters of Our Sample of M and K Dwarfs". The Astronomical Journal 158 (2): 56. doi:10.3847/1538-3881/ab23fe. Bibcode: 2019AJ....158...56H. 
  13. ↑ Silvestri, Nicole M.; Oswalt, Terry D.; Hawley, Suzanne L. (2002). "Wide Binary Systems and the Nature of High-Velocity White Dwarfs". The Astronomical Journal 124 (2): 1118. doi:10.1086/341382. Bibcode: 2002AJ....124.1118S. 
  14. ↑ Limoges, M. -M.; Bergeron, P.; Lépine, S. (2015). "Physical Properties of the Current Census of Northern White Dwarfs within 40 pc of the Sun". The Astrophysical Journal Supplement Series 219 (2): 19. doi:10.1088/0067-0049/219/2/19. Bibcode: 2015ApJS..219...19L. 
  15. ↑ 15.0 15.1 15.2 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. 
  16. ↑ 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. 
  17. ↑ "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. 
  18. ↑ 18.0 18.1 "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. 
  19. ↑ "NAME Stein 2051 A". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NAME+Stein+2051+A. 
  20. ↑ "NAME Stein 2051 B". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NAME+Stein+2051+B. 
  21. ↑ 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. 



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