HD 135530

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Template:Short description

HD 135530
File:HD135530LightCurve.png
A light curve for HD 135530, plotted from data published by Burggraaff et al. (2018)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes[2]
Right ascension Template:RA[3]
Declination Template:DEC[3]
Apparent magnitude (V) 6.13Template:Snd6.15[4]
Characteristics
Evolutionary stage AGB[5]
Spectral type M2IIIa[6]
B−V Template:Engvar +1.62[7]
Variable type unclassified[8]
Astrometry
Radial velocity (Rv)Script error: No such module "val".[9] km/s
Proper motion (μ) RA: 20.065[3] mas/yr
Dec.: −14.631[3] mas/yr
Parallax (π)3.1796±0.0484 mas[3]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−1.68[2]
Details
Mass1.2[10] Template:Solar mass
Radius79[11] Template:Solar radius
Luminosity1,204[11] Template:Solar luminosity
Surface gravity (log g)0.56[10] cgs
Temperature3,820[11] K
Metallicity [Fe/H]−0.17[10] dex
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
NSV 20281, BD+42°2577, HD 135530, HIP 74571, HR 5677, SAO 45445
Database references
SIMBADdata

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HD 135530 is a variable star in the northern constellation of Boötes. With an average apparent magnitude of 6.14,[8] it is very faintly visible to the naked eye under excellent observing conditions.

HD 135530 has evolved into a red giant on the asymptotic giant branch, meaning that it has exhausted its core helium and is fusing hydrogen and helium in shells outside the core.[5] Its photosphere has expanded to Template:Solar radius at an effective temperature of Script error: No such module "val". and shows a spectrum classified as M2IIIa, with IIIa indicating a star slightly more luminous than a typical giant.

Although listed only as a suspected variable in the General Catalogue of Variable Stars, observations by the MASCARA team have shown that its brightness is in fact variable, with a period of about 20 days.[1]

References

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  1. ↑ a b Script error: No such module "Citation/CS1".
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  3. ↑ a b c d e Template:Cite Gaia DR3
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  5. ↑ a b Script error: No such module "Citation/CS1".
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  7. ↑ Script error: No such module "Citation/CS1".
  8. ↑ a b Script error: No such module "citation/CS1".
  9. ↑ Script error: No such module "Citation/CS1".
  10. ↑ a b c Script error: No such module "Citation/CS1".
  11. ↑ a b c Template:Cite Gaia DR2

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External links

Template:Stars of Boötes

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