HD 17925

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Template:Short description

HD 17925
File:EPEriLightCurve.png
A visual band light curve for EP Eridani, adapted from Cutispoto (1992)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Eridanus
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) 6.04[3]
Characteristics
Evolutionary stage Main sequence
Spectral type K1V[4]
U−B Template:Engvar +1.41[5]
B−V Template:Engvar +0.86[5]
Variable type RS CVn[6]
Astrometry
Radial velocity (Rv)Script error: No such module "val".[7] km/s
Proper motion (μ) RA: 397.353[2] mas/yr
Dec.: −189.281[2] mas/yr
Parallax (π)96.5200±0.0258 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)5.97[8]
Details
Mass0.88[9] Template:Solar mass
RadiusScript error: No such module "val".[10] Template:Solar radius
LuminosityScript error: No such module "val".[2] Template:Solar luminosity
Surface gravity (log g)4.58[9] cgs
TemperatureScript error: No such module "val".[11] K
Metallicity [Fe/H]+0.10[12] dex
Rotation6.6 days[12]
Rotational velocity (v sin i)4.80[13] km/s
Age100[14] Myr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist,[15] YPC 599
Database references
SIMBADdata

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HD 17925 is a variable star in the equatorial constellation of Eridanus. It has the Gould designation 32 G. Eridani and the variable star designation EP Eri. The star has a yellow-orange hue and is dimly visible to the naked eye in good seeing conditions with an apparent visual magnitude that varies from 6.03 down to 6.08.[16] It is located nearby at a distance of 34 light years from the Sun based on parallax,[2] and is drifting further away with a radial velocity of +18 km/s.[7] It is a likely member of the Local Association of nearby, co-moving stars.[12] The spectrum shows a strong abundance of lithium, indicating that it is young star.[17] This likely makes its point of origin the nearby Scorpio–Centaurus Complex.[18]

The stellar classification of HD 17925 is K1V,[4] which indicates this is a K-type main-sequence star that is engaged in core hydrogen fusion. It is an active star[17] that is classified as a RS Canum Venaticorum variable,[16] showing a rotational modulation with a period of 6.9 days, and has been observed to flare.[6] The star has an estimated age of 100[14] million years and is spinning with a projected rotational velocity of 4.8 km/s.[13] The rotation period of 6.6 days days can be determined from its activity cycle.[12] The star has 88%[9] of the mass of the Sun and 85%[10] of the Sun's radius. It is radiating 41%[2] of the luminosity of the Sun from its photosphere at an effective temperature of 5,225 K.[11]

The presence of an unseen companion has been suggested based on variations in the widths of absorption lines in the star's photosphere.[17] It displays low-amplitude radial velocity variation, which may indicate it is a spectroscopic binary.[10] However, the binary hypothesis doesn't appear to be consistent with Hipparcos satellite data.[12] An infrared excess has been detected around this star, most likely indicating the presence of a circumstellar disk at a radius of 17.9 AU. The temperature of this dust is 52 K.[19]

References

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  2. ↑ a b c d e f g h Template:Cite Gaia DR3
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  4. ↑ a b Script error: No such module "citation/CS1".
  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. ↑ Script error: No such module "citation/CS1".
  9. ↑ a b c Script error: No such module "citation/CS1".
  10. ↑ a b c Script error: No such module "citation/CS1".
  11. ↑ a b Script error: No such module "citation/CS1".
  12. ↑ a b c d e 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. ↑ Template:Cite simbad
  16. ↑ a b Script error: No such module "citation/CS1".
  17. ↑ a b c 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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Further reading

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External links

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Template:Stars of Eridanus

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