49 Ceti

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49 Ceti
Cetus constellation map.svg
Red circle.svg
Location of 49 Ceti (circled)
Observation data
Epoch J2000        Equinox J2000
Constellation Cetus
Right ascension 01h 34m 37.77883s [1]
Declination −15° 40 34.8981 [1]
Apparent magnitude  (V)5.607 [2]
Characteristics
Spectral type A1V [3]
U−B color index +0.05 [4]
B−V color index +0.07 [4]
Astrometry
Radial velocity (Rv)+10.30±0.7 [5]  km/s
Proper motion (μ)RA: 94.207 [1]   mas/yr
Dec.: -3.165 [1]   mas/yr
Parallax (π)17.5234 ± 0.1001  mas [1]
Distance 186 ± 1  ly
(57.1 ± 0.3  pc)
Details [6]
Mass 2.02  M
Luminosity 19.12  L
Surface gravity (log g)4.30 [7]   cgs
Temperature 8,790  K
Metallicity [Fe/H]0.10  dex
Rotational velocity (v sin i)196 km/s
Age 40 [8]   Myr
Other designations
BD−16°265, HD  9672, HIP  7345, HR  451, SAO  147886
Database references
SIMBAD data

49 Ceti is a single [9] star in the equatorial constellation of Cetus. It is visible to the naked eye as a dim, white-hued star with an apparent visual magnitude of 5.607. [2] The star is located 186 light-years (57 parsecs) away from the Solar System, based on its parallax, [1] and is drifting further away with a radial velocity of +10 km/s. [5] 49 Ceti has been identified as a member of the 40-million-year-old Argus Association. [8]

This is a young A-type main-sequence star with a stellar classification of A1V. [3] It is about 40 [8]  million years old with a high rate of spin, showing a projected rotational velocity of 196 km/s. [6] The star has double the mass of the Sun. [6] It is radiating 19 times the Sun's luminosity from its photosphere at an effective temperature of 8,790 K. [6]

49 Ceti displays a significant infrared excess, which is a characteristic of a debris disk orbiting the star. Unusually, the disk seems to be gas-rich, with evidence of carbon monoxide (CO) gas. This carbon monoxide gas may possibly be from comets orbiting the star within the disk, similar to the Kuiper Belt in the Solar System. [8]

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References

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  8. 1 2 3 4 Zuckerman, B.; Song, Inseok (2012). "A 40 Myr Old Gaseous Circumstellar Disk at 49 Ceti: Massive CO-Rich Comet Clouds at Young A-Type Stars". The Astrophysical Journal. 758 (2): 77. arXiv: 1207.1747 . Bibcode:2012ApJ...758...77Z. doi:10.1088/0004-637X/758/2/77. S2CID   119198485.
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