95 Herculis

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95 Herculis
Hercules constellation map.png
Red circle.svg
Location of 95 Herculis in Hercules (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Hercules
A
Right ascension 18h 01m 30.40868s [1]
Declination 21° 35′ 44.8121″ [1]
Apparent magnitude  (V)4.83±0.01 [2]
B
Right ascension 18h 01m 29.96397s [3]
Declination 21° 35′ 43.4043″ [3]
Apparent magnitude  (V)5.10 [4]
Characteristics
A
Evolutionary stage Giant star [5] or subgiant [2]
Spectral type A2IV [2]
B
Evolutionary stage Giant star
Spectral type G5III [4]
Astrometry
A
Radial velocity (Rv)−44.86±3.07 [1]  km/s
Proper motion (μ)RA: +9.200  mas/yr [1]
Dec.: +38.438  mas/yr [1]
Parallax (π)7.5526 ± 0.0713  mas [1]
Distance 432 ± 4  ly
(132 ± 1  pc)
B
Radial velocity (Rv)−32.9±0.12 [3]  km/s
Proper motion (μ)RA: +8.995  mas/yr [3]
Dec.: +36.267  mas/yr [3]
Parallax (π)7.5492 ± 0.0592  mas [3]
Distance 432 ± 3  ly
(132 ± 1  pc)
Details [5]
A
Mass 2.8  M☉
Radius 6.8  R☉
Luminosity 167  L☉
Temperature 8,000  K
Rotational velocity (v sin i)233 km/s
B
Mass 3.2  M☉
Radius 19.4  R☉
Luminosity194  L☉
Temperature 4,900  K
Rotational velocity (v sin i)5.7 km/s
Other designations
HIP  88267, ADS  10993, WDS J18015+2136
A: HD  164669, HR  6730, ADS  10993, TIC  424429430, TYC  1566-3674-1
B: HD  164668, HR  6729, TIC  424429431, TYC  1566-3675-1
Database references
SIMBAD data
A
SIMBAD data
B
SIMBAD data

95 Herculis is a double stellar system in the constellation Hercules, located 432 light-years from Earth.

Contents

Characteristics

From the naked eye, 95 Herculis appears as a single star shining at apparent magnitude 4.31. However, when further scrutinized using a telescope, it is revealed to be a double star, with two components separated by 6.3 arcseconds. This system has a color contrast due to the difference of each star's effective temperature. [5]

The brightest component, called 95 Herculis A, is a white giant [6] or subgiant with an apparent magnitude of 4.8. [2] This evolved star has 2.9 times more mass than the Sun, is 6.8 times wider, and is 167 times more luminous. Its effective temperature of 8,000 Kelvin give it a blue-white hue typical of A-type stars. It is spinning rapidly with an projected rotational velocity of 233 km/s. [5]

The secondary is called 95 Herculis B, a yellow giant [6] of apparent magnitude 5.1. [4] It is the most evolved star in the pair, having reached helium burning stage and now converting carbon into oxygen, while 95 Herculis A is still in the transition from hydrogen burning to helium burning. [6] Albeit fainter than 95 Her A, 95 Her B emmits a significant part of its luminosity in the infrared, and hence the bolometric luminosity is 194 times solar. It is 3.2 times more massive than the Sun and 19 times wider. The effective temperature of the star is 4,900 Kelvin. [5]

Orbit

The orbital elements 95 Herculis are not accurately known and no orbital motion has been detected. However, they projected separation is calculated at 900 astronomical units, with an orbital period of at least 11,000 years. [5]

See also

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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 "95 Her A". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2024-09-15.
  3. 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.
  4. 1 2 3 "95 Her B". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2024-09-15.
  5. 1 2 3 4 5 6 Kaler, Jim. "95 Herculis". stars.astro.illinois.edu. Retrieved 2024-09-15.
  6. 1 2 3 "95 Herculis". www.havastro.co.uk. Retrieved 2024-09-15.
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