1 Lyncis

1 Lyncis

A light curve for UW Lyncis, plotted from Hipparcos data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Lynx
Right ascension 06h 17m 54.81907s[2]
Declination +61° 30′ 55.0251″[2]
Apparent magnitude (V) 4.95[3]
Characteristics
Evolutionary stage asymptotic giant branch[4]
Spectral type M3IIIab[5]
U−B color index +1.96[3]
B−V color index +1.83[3]
Variable type Lb?[6]
Astrometry
Radial velocity (Rv)+11.56±0.44[7] km/s
Proper motion (μ) RA: −10.59±0.36[2] mas/yr
Dec.: −3.11±0.29[2] mas/yr
Parallax (π)5.11 ± 0.33 mas[2]
Distance640 ± 40 ly
(200 ± 10 pc)
Absolute magnitude (MV)−1.44[8]
Details
Radius156[9] R☉
Luminosity2,848[10] L☉
Temperature3,485[10] K
Other designations
1 Lyn, UW Lyn, BD+61°869, FK5 2479, HD 42973, HIP 29919, HR 2215, SAO 13787[11]
Database references
SIMBADdata

1 Lyncis is a single[5] star in the northern constellation of Lynx. It is also known by its variable star designation of UW Lyncis; 1 Lyncis is the Flamsteed designation. This object is visible to the naked eye as a faint, reddish-hued star with an apparent visual magnitude of 4.95.[3] It is moving further from the Earth with a heliocentric radial velocity of 12 km/s.[7]

The star is an aging red giant of spectral type M3IIIab,[5] currently on the asymptotic giant branch,[4] having exhausted the hydrogen at its core and evolved away from the main sequence. It has been classified as a possible slow irregular variable,[6] after being found to be slightly variable in 1969 by Olin J. Eggen.[12] Its changes in brightness are complex, with two shorter changeable periods of 35–40 and 47–50 days due to the star's pulsations, and a longer period of 1,500 days possibly due to the star's rotation or convectively induced oscillatory thermal (COT) mode.[13] The star has expanded to 156[9] times the Sun's radius and it is radiating 2,848[10] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 3,485 K.[10]

  1. ^ Cite error: The named reference CDS was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference MERMILLIOD was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Eggen1992 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Eggleton was invoked but never defined (see the help page).
  6. ^ a b Watson, Christopher (4 January 2010). "UW Lyncis". AAVSO Website. American Association of Variable Star Observers. Retrieved 10 March 2016.
  7. ^ a b Cite error: The named reference Famaey2005 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference dr2 was invoked but never defined (see the help page).
  10. ^ a b c d Cite error: The named reference Mcdonald2012 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference eggen1969 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Percy 2001 was invoked but never defined (see the help page).