HR 7135

Last updated
HR 7135
Observation data
Epoch J2000       Equinox J2000
Constellation Aquila [1]
Right ascension 18h 55m 27.46151s [2]
Declination +06° 36′ 55.1499″ [2]
Apparent magnitude  (V)5.57 [3]
Characteristics
Evolutionary stage red clump [4]
Spectral type G9 III [5]
U−B color index +0.87 [3]
B−V color index +1.041±0.002 [1]
Astrometry
Radial velocity (Rv)23.31±0.09 [6] km/s
Proper motion (μ)RA: +7.972 [2] mas/yr
Dec.: –92.211 [2] mas/yr
Parallax (π)11.5405±0.1636  mas [2]
Distance 283 ± 4  ly
(87 ± 1  pc)
Absolute magnitude  (MV)0.87 [1]
Orbit [6] [7]
PrimaryHR 7135 A
CompanionHR 7135 B
Period (P)2,994±29 d
Semi-major axis (a)26.6±3.4  mas
Eccentricity (e)0.243±0.026
Inclination (i)31.9±3.6°
Longitude of the node (Ω)12.6±7.7°
Periastron epoch (T)2444276.5±52  JD
Argument of periastron (ω)
(secondary)		35±7°
Semi-amplitude (K1)
(primary)		4.65±0.13 km/s
Details
HR 7135 A
Mass 1.54 [8]   M☉
Radius 10.69+0.17
−0.93 [2]   R☉
Luminosity 52.8±0.9 [2]   L☉
Surface gravity (log g)2.7 [9]   cgs
Temperature 4,666±51 [8]   K
Metallicity [Fe/H]–0.26 [9]   dex
Rotational velocity (v sin i)0.0 [9]  km/s
Age 3.21 [8]   Gyr
Other designations
62 Ser, BD+06°3978, FK5 3509, HD 175515, HIP 92872, HR 7135, SAO 124050 [10]
Database references
SIMBAD data

HR 7135 is a binary star system. Despite its Flamsteed designation of 62 Serpentis, the star can be found in the equatorial constellation of Aquila, [11] in front of a dark rift in the Milky Way near the constellation border. [6] It is visible to the naked eye as a dim, yellow-hued point of light with an apparent visual magnitude of 5.57. [3] The system is located 283  light years distant from the Sun, based on parallax, [2] and is drifting further away with a radial velocity of 23 km/s. [6]

Discovery of the binary nature of this system is credited to Canadian astronomer H. H. Plaskett in 1922. It is a single-lined spectroscopic binary with an orbital period of 8.2 years and an eccentricity of 0.24. [6] [7] The visible component is an aging giant star with a stellar classification of G9 III, [5] having exhausted the supply of hydrogen at its core and expanded to 10.7 [2] times the Sun's radius. It is a red clump giant, indicating it is on the horizontal branch and is generating energy via core helium fusion. [4] The star is 3.2 [8]  billion years old with 1.54 [8] times the mass of the Sun. It is radiating 53 [2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,666 K. [8] The star has a very low rate of spin, with the projected rotational velocity being too small to measure. [9]

References

  1. 1 2 3 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters , 38 (5): 331, arXiv: 1108.4971 , Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
  2. 1 2 3 4 5 6 7 8 9 10 Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics . 616. A1. arXiv: 1804.09365 . Bibcode: 2018A&A...616A...1G . doi: 10.1051/0004-6361/201833051 . Gaia DR2 record for this source at VizieR.
  3. 1 2 3 Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J.
  4. 1 2 Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity", The Astrophysical Journal, 539 (2): 732–741, arXiv: astro-ph/0003329 , Bibcode:2000ApJ...539..732A, doi:10.1086/309278, S2CID   16673121.
  5. 1 2 McWilliam, Andrew (December 1990), "High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances", Astrophysical Journal Supplement Series, 74: 1075–1128, Bibcode:1990ApJS...74.1075M, doi: 10.1086/191527
  6. 1 2 3 4 5 Griffin, R. F. (1981), "Spectroscopic binary orbits from photoelectric radial velocities. Paper 41: HR 7135", The Observatory, 101: 208–211, Bibcode:1981Obs...101..208G.
  7. 1 2 Jancart, S.; et al. (2005), "Astrometric orbits of SB9 stars", Astronomy and Astrophysics, 442 (1): 365–380, arXiv: astro-ph/0507695 , Bibcode:2005A&A...442..365J, doi:10.1051/0004-6361:20053003, S2CID   15123997.
  8. 1 2 3 4 5 6 Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal, 150 (3), 88, arXiv: 1507.01466 , Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID   118505114.
  9. 1 2 3 4 Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi: 10.1088/0004-6256/135/1/209 .
  10. ↑ "HD 175515". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2019-08-04.
  11. ↑ Kaler, James B. (1996), The ever-changing sky: a guide to the celestial sphere, Cambridge University Press, p. 119, ISBN   0-521-38053-7.
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