Tau1 Serpentis

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τ1 Serpentis
File:Tau1SerLightCurve.png
A light curve for Tau1 Serpentis, plotted from Hipparcos data[1]
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Serpens
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) 5.16[3] (5.13 to 5.20)[4]
Characteristics
Evolutionary stage AGB[5]
Spectral type M1III[6]
U−B Template:Engvar +1.95[7]
B−V Template:Engvar Script error: No such module "val".[3]
R−I Template:Engvar +1.04[7]
Astrometry
Radial velocity (Rv)Script error: No such module "val".[3] km/s
Proper motion (μ) RA: −12.467[2] mas/yr
Dec.: −7.740[2] mas/yr
Parallax (π)3.3030±0.1988 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−1.45[3]
Details
Mass2.3[8] Template:Solar mass
RadiusScript error: No such module "val".[2] Template:Solar radius
LuminosityScript error: No such module "val".[2] Template:Solar luminosity
Surface gravity (log g)Script error: No such module "val".[9] cgs
TemperatureScript error: No such module "val".[2] K
Metallicity [Fe/H]Script error: No such module "val".[9] dex
Age933[8] Myr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[10]
Database references
SIMBADdata

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Tau1 Serpentis, Latinized from τ1 Serpentis, is a single[11] star in the Caput (Head) segment of the equatorial constellation of Serpens. It is a red hued star that is dimly visible to the naked eye with an apparent visual magnitude of 5.16.[3] Based upon parallax measurements, this star is located at a distance of approximately 990 light years from the Sun,[2] while it is drifting closer with a radial velocity of −16.5 km/s.[3]

This object is an aging red giant star, currently on the asymptotic giant branch,[5] with a stellar classification of M1III.[6] Having exhausted the supply of hydrogen at its core, it has cooled and expanded until it has around 99 times the girth of the Sun.[2] It is a suspected variable star with a brightness that has been measured varying from magnitude 5.13 down to 5.20.[4] The Hipparcos data for Tau1 Serpentis shows brightness variations with a period of 6.4675 days, and an amplitude of 0.0066 magnitudes.[12] The star is radiating 2,158 times the luminosity of the Sun from its swollen photosphere at an effective temperature of Script error: No such module "val"..[2]

References

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  5. ↑ a b Script error: No such module "citation/CS1".
  6. ↑ a b Script error: No such module "citation/CS1".
  7. ↑ a b Script error: No such module "citation/CS1".
  8. ↑ a b Script error: No such module "Citation/CS1".
  9. ↑ a b Script error: No such module "citation/CS1".
  10. ↑ Template:Cite simbad
  11. ↑ Script error: No such module "citation/CS1".
  12. ↑ Script error: No such module "Citation/CS1".

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Template:Stars of Serpens

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