Английская Википедия:HD 17925

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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.[1] 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.[3] It is a likely member of the Local Association of nearby, co-moving stars.[4] The spectrum shows a strong abundance of lithium, indicating that it is young star.[5] This likely makes its point of origin the nearby Scorpio–Centaurus Complex.[6]

The stellar classification of HD 17925 is K1V,[7] which indicates this is a K-type main-sequence star that is engaged in core hydrogen fusion. It is an active star[5] that is classified as a RS Canum Venaticorum variable,[1] showing a rotational modulation with a period of 6.9 days, and has been observed to flare.[8] The star has an estimated age of 100[9] million years and is spinning with a projected rotational velocity of 4.8 km/s.[10] The rotation period of 6.6 days days can be determined from its activity cycle.[4] The star has 88%[11] of the mass of the Sun and 85%[12] 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.[13]

The presence of an unseen companion has been suggested based on variations in the widths of absorption lines in the star's photosphere.[5] It displays low-amplitude radial velocity variation, which may indicate it is a spectroscopic binary.[12] However, the binary hypothesis doesn't appear to be consistent with Hipparcos satellite data.[4] 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.[14]

References

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Further reading

External links

Шаблон:Stars of Eridanus

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