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ADS 7251

Coordinates:Sky map09h 14m 22.7749s, +52° 41′ 11.792″
From Wikipedia, the free encyclopedia
Binary star system in the constellation Ursa Major
ADS 7251
ADS 7251 is located in the constellation Ursa Major
ADS 7251 is located in the constellation Ursa Major
ADS 7251
Location of ADS 7251 in the constellationUrsa Major

Observation data
Epoch J2000      Equinox J2000
ConstellationUrsa Major
ADS 7251 A
Right ascension09h 14m 22.7749s[1]
Declination+52° 41′ 11.792″[1]
Apparent magnitude (V)7.64[2]
ADS 7251 B
Right ascension09h 14m 24.6828s[3]
Declination+52h 41m 10.902s[3]
Apparent magnitude (V)7.70[2]
Characteristics
ADS 7251 A (HD 79210)
Spectral typeM0V[4]
Apparent magnitude (B)9.05[2]
Apparent magnitude (G)6.976[1]
Apparent magnitude (J)4.89[a][5]
Apparent magnitude (H)3.987[a][5]
Apparent magnitude (K)3.99[a][5]
B−Vcolor index+1.41[6]
J−Hcolor index+0.90[b]
J−Kcolor index+0.90[b]
ADS 7251 B (HD 79211)
Spectral typeK7V[4]
Apparent magnitude (B)9.04[2]
Apparent magnitude (G)7.054[3]
Apparent magnitude (J)4.779[a][5]
Apparent magnitude (H)4.043[a][5]
Apparent magnitude (K)4.14[a][5]
B−Vcolor index+1.42[6]
J−Hcolor index+0.74[b]
J−Kcolor index+0.64[b]
Astrometry
ADS 7251 A (HD 79210)
Radial velocity (Rv)11.245±0.0007[1] km/s
Proper motion (μ)RA: −1,545.787(18)[1]mas/yr
Dec.: −569.053(18)[1]mas/yr
Parallax (π)157.8879±0.0197 mas[1]
Distance20.657 ± 0.003 ly
(6.3336 ± 0.0008 pc)
Absolute magnitude (MV)8.637[7]
ADS 7251 B
Radial velocity (Rv)12.104±0.0008[3] km/s
Proper motion (μ)RA: −1,573.040(18)[3] mas/yr
Dec.: −659.906(19)[3] mas/yr
Parallax (π)157.8825 ± 0.0211 mas[3]
Distance20.658 ± 0.003 ly
(6.3338 ± 0.0008 pc)
Absolute magnitude (MV)8.712[7]
Orbit[8]
Period (P)975yr
Semi-major axis (a)16.725″
Eccentricity (e)0.28
Details[9]
A
Mass0.69±0.07 M☉
Radius0.58±0.02 R☉
Luminosity0.0789±0.0038 L☉
Surface gravity (log g)4.68±0.07 cgs
Temperature4,024±51 K
Metallicity [Fe/H]−0.05±0.16 dex
Rotation16.3+3.5
−1.3 d
Rotational velocity (v sin i)2.9±1.2 km/s
Age1–7 Gyr
B
Mass0.64±0.07 M☉
Radius0.58±0.03 R☉
Luminosity0.0792±0.0031 L☉
Surface gravity (log g)4.68±0.07 cgs
Temperature4,005±51 K
Metallicity [Fe/H]−0.03±0.16 dex
Rotation16.61±0.04 d
Rotational velocity (v sin i)2.3±1.5 km/s
Age1–7 Gyr
Other designations
GJ 338,ADS 7251,WDS J09144+5241
A:BD+53°1320,HD 79210,HIP 45343
B:BD+53°1321,HD 79211,HIP 120005
Database references
SIMBADThe system
A
B

ADS 7251 is abinary star system6.33 parsecs (20.66 light years) from theSun. The components are near-identicalred dwarfs separated by17″ in 2019.

The two stars share a mildly eccentric orbit with asemimajor axis of16.725″ and a period of 975 years. Their separation has closed from21.1″ when they were discovered byF. G. W. Struve in 1821 to16.9″ in 2019. Struve also documented two much fainter stars about3′ from the two red dwarfs.[10]

ADS 7251 A is 0.06magnitudes (six percent) brighter than ADS 7251 B. A catalogue of MK spectral classes lists both stars as secondary standards, with ADS 7251 A being class M0V and ADS 7251 B being class K7V, noted as being unusual in the brighter star having a later spectral type.[4] Other publications have described the stars as being both K7V, both M0V, or the primary being K7V and the secondary M0V.[11][9]

Planetary system

[edit]

ADS 7251 B, also known as Gliese 338 B or HD 79211, is orbited by one known planet discovered in 2020 byradial velocity. Though described as asuper-Earth by its discovery paper, it is closer in mass toUranus.[9] An independent confirmation of the planet was published in 2022.[12]

The ADS 7251 B (Gliese 338 B) planetary system[12]
Companion
(in order from star)		MassSemimajor axis
(AU)		Orbital period
(days)		EccentricityInclinationRadius
b≥10.6±1.2 M🜨0.142±0.00524.422±0.0140.109+0.100
−0.075		——

Notes

[edit]
  1. ^abcdef2MASS infrared magnitudes flagged as unreliable or upper limits
  2. ^abcdCalculated from2MASS magnitudes

References

[edit]
  1. ^abcdefgVallenari, 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 atVizieR.
  2. ^abcdHuang, Y.; Liu, X. -W.; Yuan, H. -B.; Xiang, M. -S.; Chen, B. -Q.; Zhang, H. -W. (2015)."Empirical metallicity-dependent calibrations of effective temperature against colours for dwarfs and giants based on interferometric data".Monthly Notices of the Royal Astronomical Society.454 (3): 2863.arXiv:1508.06080.Bibcode:2015MNRAS.454.2863H.doi:10.1093/mnras/stv1991.S2CID 118487917.
  3. ^abcdefgVallenari, 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 atVizieR.
  4. ^abcKirkpatrick, J. D.; et al. (1991)."A standard stellar spectral sequence in the red/near-infrared - Classes K5 to M9".Astrophysical Journal Supplement Series.77: 417.Bibcode:1991ApJS...77..417K.doi:10.1086/191611.
  5. ^abcdefCutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E.; Fowler, John W.; Gizis, John E.; Howard, Elizabeth V.; Huchra, John P.; Jarrett, Thomas H.; Kopan, Eugene L.; Kirkpatrick, J. Davy; Light, Robert M.; Marsh, Kenneth A.; McCallon, Howard L.; Schneider, Stephen E.; Stiening, Rae; Sykes, Matthew J.; Weinberg, Martin D.; Wheaton, William A.; Wheelock, Sherry L.; Zacarias, N. (2003)."VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)".CDS/ADC Collection of Electronic Catalogues.2246: II/246.Bibcode:2003yCat.2246....0C.
  6. ^abBobylev, V. V.; Goncharov, G. A.; Bajkova, A. T. (2007). "VizieR Online Data Catalog: Orion Spiral Arm CAtalogue (OSACA) (Bobylev+, 2006)".VizieR On-line Data Catalog.Bibcode:2007yCat..90830821B.
  7. ^abHoudebine, 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.arXiv:1905.07921.Bibcode:2019AJ....158...56H.doi:10.3847/1538-3881/ab23fe.S2CID 159041104.
  8. ^Malkov, O. Yu.; et al. (2012)."Dynamical Masses of a Selected Sample of Orbital Binaries".Astronomy & Astrophysics.546: 5.Bibcode:2012A&A...546A..69M.doi:10.1051/0004-6361/201219774. A69.
  9. ^abcGonzález-Álvarez, E.; Osorio, M. R. Zapatero; Caballero, J. A.; Sanz-Forcada, J.; Béjar, V. J. S.; González-Cuesta, L.; Dreizler, S.; Bauer, F. F.; Rodríguez, E.; Tal-Or, L.; Zechmeister, M. (May 2020)."The CARMENES search for exoplanets around M dwarfs. A super-Earth planet orbiting HD 79211 (GJ 338 B)".Astronomy & Astrophysics.637: A93.arXiv:2003.13052.Bibcode:2020A&A...637A..93G.doi:10.1051/0004-6361/201937050.ISSN 0004-6361.
  10. ^Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001)."The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog".The Astronomical Journal.122 (6):3466–3471.Bibcode:2001AJ....122.3466M.doi:10.1086/323920.
  11. ^Skiff, B. A. (2014). "VizieR Online Data Catalog: Catalogue of Stellar Spectral Classifications (Skiff, 2009-2016)".VizieR On-line Data Catalog: B/Mk. Originally Published in: Lowell Observatory (October 2014).1.Bibcode:2014yCat....1.2023S.
  12. ^abDitomasso, Victoria; et al. (2023), "Independent Validation of the Temperate Super-Earth HD 79211 b using HARPS-N",The Astronomical Journal,165 (2): 38,arXiv:2210.12211,Bibcode:2023AJ....165...38D,doi:10.3847/1538-3881/ac9ccd,S2CID 253098124
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