ET Andromedae

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Template:Short description

ET Andromedae
File:ETAndLightCurve.png
The visual band light curve of ET Andromedae, adapted from Blanco et al. (1980)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) 6.48[3]
Characteristics
Spectral type A0 Vp SiSr[4] or B9p SI[5]
B−V Template:Engvar Script error: No such module "val".[3]
Variable type α2 CVn
Astrometry
Radial velocity (Rv)Script error: No such module "val".[3] km/s
Proper motion (μ) RA: +24.740[2] mas/yr
Dec.: −11.038[2] mas/yr
Parallax (π)5.4200±0.0572 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)0.58[6]
Orbit[7]
Period (P)Script error: No such module "val".
Eccentricity (e)Script error: No such module "val".
Periastron epoch (T)Script error: No such module "val".
Argument of periastron (ω)
(secondary)		Script error: No such module "val".°
Semi-amplitude (K1)
(primary)		Script error: No such module "val". km/s
Details
Mass3.25[8] Template:Solar mass
Radius2.7[9] Template:Solar radius
Luminosity91.06[3] Template:Solar luminosity
Surface gravity (log g)3.81[10] cgs
Temperature11,444[10] K
Rotation1.62 d[11]
Rotational velocity (v sin i)65[12] km/s
Age284[6] Myr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[13]
Database references
SIMBADdata

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ET Andromedae is a binary star system star in the northern constellation of Andromeda.[14] It has an apparent visual magnitude of 6.48,[3] placing it at the nominal limit for visibility with the naked eye. The distance to this system can be estimated from its annual parallax shift of Script error: No such module "val".,[2] which yields a value of 602 light years.

Variations in the radial velocity of this star suggest it is a single-lined spectroscopic binary system. This yields orbital elements with a period of 48.3 days and an eccentricity of 0.50. The a sin i value for the primary is Script error: No such module "convert"., where a is the semimajor axis and i is the (unknown) orbital inclination.[7]

The visible component is a well-studied magnetic chemically peculiar star[15] with a stellar classification of A0 Vp SiSr.[4] The SiSr notation indicates unusual abundances of silicon and strontium in the spectrum. It has a magnetic field with an average surface value of Script error: No such module "val"..[16] The abundance of silicon varies depending on the viewing angle.[15]

In 1953, Sanford S. Provin announced that HD 219749 might be photometrically variable, based on observations made at Yerkes Observatory.[17] Variability was confirmed from Lowell Observatory measurements published by Karl D. Rakos in 1962.[18] The star is an Alpha2 Canum Venaticorum variable with a period of 1.618875 days.[19]

References

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  7. ↑ a b Script error: No such module "Citation/CS1".
  8. ↑ Script error: No such module "Citation/CS1".
  9. ↑ Script error: No such module "Citation/CS1".
  10. ↑ a b Script error: No such module "Citation/CS1".
  11. ↑ Script error: No such module "citation/CS1".
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  13. ↑ Template:Cite simbad
  14. ↑ Script error: No such module "citation/CS1".
  15. ↑ a b Script error: No such module "Citation/CS1".
  16. ↑ Script error: No such module "Citation/CS1".
  17. ↑ Script error: No such module "Citation/CS1".
  18. ↑ Script error: No such module "Citation/CS1".
  19. ↑ Script error: No such module "citation/CS1".

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Template:Stars of Andromeda

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