72 Herculis

Last updated
72 Herculis
Observation data
Epoch J2000       Equinox J2000
Constellation Hercules
Right ascension 17h 20m 39.56745s [1]
Declination +32° 28′ 03.8780″ [1]
Apparent magnitude  (V)5.377±0.005 [2]
Characteristics
Evolutionary stage subgiant [1]
Spectral type G0 V [3]
U−B color index +0.06 [4]
B−V color index +0.62 [4]
Variable type Suspected
Astrometry
Radial velocity (Rv)−78.608±0.0065 [5] km/s
Proper motion (μ)RA: +135.810 [1] mas/yr
Dec.: −1,040.953 [1] mas/yr
Parallax (π)68.5575±0.0553  mas
Distance 47.57 ± 0.04  ly
(14.59 ± 0.01  pc)
Absolute magnitude  (MV)4.43±0.05 [2]
Details
Mass 0.93 [6]   M☉
Radius 1.17 [6]   R☉
Luminosity 1.30 [6]   L☉
Surface gravity (log g)4.33 [6]   cgs
Temperature 5,704 [6]   K
Metallicity [Fe/H]−0.31±0.11 [7]   dex
Rotation 21 days [8]
Rotational velocity (v sin i)1.0±1.0 [2]  km/s
Age 13 [6]   Gyr
Other designations
w Her, 72 Her, NSV 8553, BD+32°2896, FK5 1456, GJ 672, HD 157214, HIP 84862, HR 6458, SAO 65963, LHS 441, LTT 15148 [9]
Database references
SIMBAD data

72 Herculis is a single [10] star in the northern constellation of Hercules. The Flamsteed designation for this star comes from the publication Historia Coelestis Britannica by John Flamsteed. It is the 72nd star in Flamsteed's list of stars in Hercules. This star is faintly visible to the naked eye with an apparent visual magnitude of 5.4. [2] Parallax measurements show this star to be located at a distance of about 48 light years from the Sun. [1] It is drifting closer with a radial velocity of −78.6 km/s, [5] and is predicted to come to within 32.1 light-years in around 98,000 years. [11]

This is an ordinary G-type main-sequence star with a stellar classification of G0 V. It is similar in mass to the Sun, with a 17% larger radius. The star is radiating 1.3 times the luminosity of the Sun from its photosphere at an effective temperature of 5,704 K. [6] The metallicity is much lower than in the Sun, with an [Fe/H] equal to −0.31±0.11. [7] The star is an estimated 13 billion years old [6] with a projected rotational velocity of 1 km/s. [2] The level of chromospheric activity appears to be at or below that in the Sun. [12]

As of 2010, no planetary companion had been detected orbiting this star. [13] The Washington Visual Double Star Catalog for 1996 showed two visual companions of this star. The first is a visual magnitude 9.7 star located 289.1 arc seconds away. The second is only separated by 8.7 arc seconds, and is magnitude 12.9. [14] It is unknown whether these visual companions are gravitationally-bound to 72 Her.

References

  1. 1 2 3 4 5 6 Vallenari, 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 at VizieR.
  2. 1 2 3 4 5 Fuhrmann, Klaus (February 2008). "Nearby stars of the Galactic disc and halo - IV". Monthly Notices of the Royal Astronomical Society . 384 (1): 173–224. Bibcode:2008MNRAS.384..173F. doi: 10.1111/j.1365-2966.2007.12671.x .
  3. ↑ Cenarro, A. J.; et al. (July 2009). "Mg and TiO spectral features at the near-IR: spectrophotometric index definitions and empirical calibrations". Monthly Notices of the Royal Astronomical Society. 396 (4): 1895–1914. arXiv: 0903.4835 . Bibcode:2009MNRAS.396.1895C. doi: 10.1111/j.1365-2966.2009.14839.x . S2CID   15729759.
  4. 1 2 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. SIMBAD. Bibcode:1986EgUBV........0M.
  5. 1 2 Soubiran, C.; et al. (2018). "Gaia Data Release 2. The catalogue of radial velocity standard stars". Astronomy and Astrophysics. 616: A7. arXiv: 1804.09370 . Bibcode:2018A&A...616A...7S. doi:10.1051/0004-6361/201832795. S2CID   52952408.
  6. 1 2 3 4 5 6 7 8 Tuchow, Noah W.; Stark, Christopher C.; Mamajek, Eric (2024). "HPIC: The Habitable Worlds Observatory Preliminary Input Catalog". The Astronomical Journal. 167 (3): 139. Bibcode:2024AJ....167..139T. doi: 10.3847/1538-3881/ad25ec .
  7. 1 2 Stonkutė, E.; et al. (2020). "High-resolution Spectroscopic Study of Dwarf Stars in the Northern Sky: Lithium, Carbon, and Oxygen Abundances". The Astronomical Journal. 159 (3): 90. arXiv: 2002.05555 . Bibcode:2020AJ....159...90S. doi: 10.3847/1538-3881/ab6a19 . S2CID   211096705.
  8. ↑ Isaacson, Howard; Fischer, Debra (2010). "Chromospheric Activity and Jitter Measurements for 2630 Stars on the California Planet Search". The Astrophysical Journal. 725 (1): 875. arXiv: 1009.2301 . Bibcode:2010ApJ...725..875I. doi:10.1088/0004-637X/725/1/875.
  9. ↑ "72 Her". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 31 January 2018.
  10. ↑ Fuhrmann, K.; et al. (February 2017). "Multiplicity among Solar-type Stars". The Astrophysical Journal. 836 (1): 23. Bibcode:2017ApJ...836..139F. doi: 10.3847/1538-4357/836/1/139 . 139.
  11. ↑ Bailer-Jones, C.A.L.; et al. (2018). "New stellar encounters discovered in the second Gaia data release". Astronomy & Astrophysics. 616: A37. arXiv: 1805.07581 . Bibcode:2018A&A...616A..37B. doi:10.1051/0004-6361/201833456. S2CID   56269929.
  12. ↑ Hall, Jeffrey C.; et al. (July 2009). "The Activity and Variability of the Sun and Sun-Like Stars. II. Contemporaneous Photometry and Spectroscopy of Bright Solar Analogs". The Astronomical Journal. 138 (1): 312–322. Bibcode:2009AJ....138..312H. doi: 10.1088/0004-6256/138/1/312 . S2CID   12332945.
  13. ↑ Lubin, Dan; et al. (June 2010). "Lithium Abundance in Solar-type Stars with Low Chromospheric Activity: Application to the Search for Maunder Minimum Analogs". The Astrophysical Journal. 716 (1): 766–775. Bibcode:2010ApJ...716..766L. doi: 10.1088/0004-637X/716/1/766 .
  14. ↑ Mason, B. D.; et al. (2014). "The Washington Visual Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. Bibcode:2001AJ....122.3466M. doi: 10.1086/323920 .
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