Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Andromeda |
Right ascension | 00h 22m 23.14956s [2] |
Declination | +26° 59′ 45.73676″ [2] |
Apparent magnitude (V) | 7.70 – 14.30 variable [3] |
Characteristics | |
Spectral type | M4e-M7.5e [3] |
B−V color index | 2.63 [4] |
Variable type | Mira [3] |
Astrometry | |
Radial velocity (Rv) | −90±10 [4] km/s |
Proper motion (μ) |
RA: −7.108
[2]
mas/
yr Dec.: −3.352 [2] mas/ yr |
Parallax (π) | 0.5913 ± 0.0815 mas [2] |
Distance | approx. 5,500
ly (approx. 1,700 pc) |
Details | |
Mass | 4.9 [5] M☉ |
Luminosity | 8.928 [6] L☉ |
Surface gravity (log g) | −0.51 [5] cgs |
Temperature | 3,235 [5] K |
Metallicity [Fe/H] | −0.39 [5] dex |
Other designations | |
Database references | |
SIMBAD | data |
T Andromedae (T And) is a variable star of the Mira type in the constellation Andromeda. Like all the stars of this kind, T And is a cool asymptotic giant branch star of spectral type M4e-M7.5e. Its brightness varies periodically, completing a cycle in 281 days. The peak luminosity, however, is different every variability cycle, but can reach a peak magnitude mv=7.70. [3]
Thomas David Anderson discovered that T Andromedae is a variable star, in 1894. [7] The next year, Edward Charles Pickering examined archival photographic plates to derive a light curve for the star, and calculated a period of 281 days. [8]
Measurements of the angular size variations of T And made with the Palomar Testbed Interferometer show no clear correlation with the star's brightness variations. [9] [10]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Andromeda |
Right ascension | 00h 22m 23.14956s [2] |
Declination | +26° 59′ 45.73676″ [2] |
Apparent magnitude (V) | 7.70 – 14.30 variable [3] |
Characteristics | |
Spectral type | M4e-M7.5e [3] |
B−V color index | 2.63 [4] |
Variable type | Mira [3] |
Astrometry | |
Radial velocity (Rv) | −90±10 [4] km/s |
Proper motion (μ) |
RA: −7.108
[2]
mas/
yr Dec.: −3.352 [2] mas/ yr |
Parallax (π) | 0.5913 ± 0.0815 mas [2] |
Distance | approx. 5,500
ly (approx. 1,700 pc) |
Details | |
Mass | 4.9 [5] M☉ |
Luminosity | 8.928 [6] L☉ |
Surface gravity (log g) | −0.51 [5] cgs |
Temperature | 3,235 [5] K |
Metallicity [Fe/H] | −0.39 [5] dex |
Other designations | |
Database references | |
SIMBAD | data |
T Andromedae (T And) is a variable star of the Mira type in the constellation Andromeda. Like all the stars of this kind, T And is a cool asymptotic giant branch star of spectral type M4e-M7.5e. Its brightness varies periodically, completing a cycle in 281 days. The peak luminosity, however, is different every variability cycle, but can reach a peak magnitude mv=7.70. [3]
Thomas David Anderson discovered that T Andromedae is a variable star, in 1894. [7] The next year, Edward Charles Pickering examined archival photographic plates to derive a light curve for the star, and calculated a period of 281 days. [8]
Measurements of the angular size variations of T And made with the Palomar Testbed Interferometer show no clear correlation with the star's brightness variations. [9] [10]