NO Aurigae

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Template:Short description

NO Aurigae
Template:Location mark
Location of NO Aurigae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 6.21[2] (6.06 - 6.44[3])
Characteristics
Evolutionary stage Asymptotic giant branch[4]
Spectral type M2S Iab[3]
U−B Template:Engvar +2.22[5]
B−V Template:Engvar +2.09[5]
R−I Template:Engvar +1.41[5]
Variable type LC[3]
Astrometry
Radial velocity (Rv)Script error: No such module "val".[6] km/s
Proper motion (μ) RA: Script error: No such module "val".[1] mas/yr
Dec.: Script error: No such module "val".[1] mas/yr
Parallax (π)0.9189±0.0930 mas[1]
Distanceapprox. Template:Rnd ly
(approx. Template:Rnd pc)
Absolute magnitude (MV)−5.88[2]
Details
MassScript error: No such module "val".[7] Template:Solar mass
RadiusTemplate:Solar radius calculator[8] Template:Solar radius
Luminosity30,900[8] Template:Solar luminosity
Surface gravity (log g)−0.037[9] cgs
Temperature3,651Template:+-[8] K
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
BD+31°1049, HD 37536, HIP 26718, HR 1939, SAO 58322
Database references
SIMBADdata

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NO Aurigae is a pulsating variable star in the constellation Auriga. It is an unusually-luminous asymptotic giant branch star about 3,500 light years away. It is a 6th magnitude star faintly visible to the naked eye under very good observing conditions.

Variability

File:NOAurLightCurve.png
A light curve for NO Aurigae plotted from Hipparcos data[10]

In 1969, Olin Jeuck Eggen announced that the star, then called HR 1939, is a variable star.[11] It was given its variable star designation in 1972.[12] NO Aurigae is listed in the General Catalogue of Variable Stars as a slow irregular variable, indicating that no regularity could be found in the brightness variations. Other studies have suggested possible periods of 102.1, 173, and 226 days, and would classify it as a semiregular variable star.[13] The maximum visual magnitude range is 6.05–6.50.[13]

Properties

Most studies of NO Aurigae treat it as a red supergiant member of the Auriga OB1 stellar association at about 1.4 kpc.[14][15] On this basis it would have a luminosity around Template:Solar luminosity and a radius around Template:Solar radius.[2][14]

NO Aurigae is an MS star, intermediate between spectral type M and S. These are typically Asymptotic Giant Branch stars which can appear with supergiant spectra due to their large size and low mass.[4] Possible detection of Technetium in the spectrum is a symptom of the third dredge-up which occurs only in late AGB stars.[15]

References

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  1. ↑ a b c d e Template:Cite Gaia EDR3
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  3. ↑ a b c Script error: No such module "Citation/CS1".
  4. ↑ a b Script error: No such module "Citation/CS1".
  5. ↑ a b c Script error: No such module "Citation/CS1".
  6. ↑ Script error: No such module "Citation/CS1".
  7. ↑ Script error: No such module "Citation/CS1". NO Aurigae's database entry at VizieR.
  8. ↑ a b c Script error: No such module "Citation/CS1".
  9. ↑ Script error: No such module "Citation/CS1".
  10. ↑ Script error: No such module "citation/CS1".
  11. ↑ Script error: No such module "Citation/CS1".
  12. ↑ Script error: No such module "Citation/CS1".
  13. ↑ a b Script error: No such module "Citation/CS1".
  14. ↑ a b Script error: No such module "Citation/CS1".
  15. ↑ a b Script error: No such module "Citation/CS1".

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External links

Template:Stars of Auriga

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