Tau4 Serpentis
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File:Tau4SerLightCurve.png A visual band light curve for Tau4 Serpentis, plotted from ASAS-SN data[1] | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Serpens |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | 5.89 to 7.07[3] |
| Characteristics | |
| Spectral type | M5IIIa[4] |
| B−V Template:Engvar | 1.2[5] |
| Variable type | SRB[3] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[5] km/s |
| Proper motion (μ) | RA: −3.623[2] mas/yr Dec.: +4.476[2] mas/yr |
| Parallax (π) | 4.5628±0.2728 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | −0.03[6] |
| Details | |
| Mass | 3.9[7] Template:Solar mass |
| Radius | 239[8] Template:Solar radius |
| Luminosity | 4,969[8] Template:Solar luminosity |
| Surface gravity (log g) | −0.14[7] cgs |
| Temperature | 3,178[7] K |
| Metallicity [Fe/H] | +0.21[7] dex |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[5] | |
| Database references | |
| SIMBAD | data |
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Tau4 Serpentis, Latinized from τ4 Serpentis, is a variable M-type giant star in the constellation of Serpens, approximately 710 light-years from the Earth.[5] Its brightness varies from magnitude 5.89 to 7.07, making it occasionally bright enough to be faintly visible to the naked eye under very good observing conditions.
With a spectral classification M5IIIa, Tau4 Serpentis is a cool red giant star. The spectrum varies,[4] and some sources classify it between M4IIIe and M6IIIe.[9] Some of its spectral lines show an inverse P Cygni profile,[10] where cold infalling gas on to the star creates redshifted hydrogen absorption lines next to the normal emission lines.[11] Sometime between the years 1868 and 1877, John Ellard Gore discovered that the star's brightness varies.[12] It is classified as a semiregular late-type variable, and its magnitude varies between +5.89 and +7.07 with a period of approximately 100 days.[3]
τ4 is unique among the stars with the Bayer designation τ Serpentis as being the only one with no HR catalog number.
References
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- ↑ Script error: No such module "citation/CS1".
- ↑ a b c d e Template:Cite Gaia DR3
- ↑ a b c tau 4 Ser, database entry, The combined table of GCVS Vols I-III and NL 67-78 with improved coordinates, General Catalogue of Variable Stars Script error: No such module "webarchive"., Sternberg Astronomical Institute, Moscow, Russia. Accessed on line September 19, 2008.
- ↑ a b Script error: No such module "Citation/CS1".
- ↑ a b c d V* tau04 Ser -- Pulsating variable Star, database entry, SIMBAD. Accessed on line September 19, 2008.
- ↑ Script error: No such module "citation/CS1".
- ↑ a b c d Script error: No such module "Citation/CS1".
- ↑ a b Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
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