AS Leonis Minoris
 A light curve for AS Leonis Minoris. The main plot shows the full light curve, and the inset shows the time around minimum brightness at an expanded scale. Adapted from Lipunov et al. (2016)[1] | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Leo Minor
|
| Right ascension | 09h 53m 10.001s[2] |
| Declination | +33° 53′ 52.76″[2] |
| Apparent magnitude (V) | 10.7 - 15.4[3] |
| Characteristics | |
| Variable type | Algol[3] |
| J09531000+3353527 | |
| Database references | |
| SIMBAD | data |
AS Leonis Minoris (AS LMi), also known as TYC 2505-672-1, is an
Leo Minor. It has by far the longest period, 69.1 years, of any known eclipsing binary.[1] During its roughly 3.45 year long eclipses, it fades by 4.5 magnitudes (about a factor of 60).[4]
AS LMi's variability was first detected in 2013, during a search for "disappearing stars" in the
ε Aurigae system.[8]
The binary system consists of an M-giant primary star orbited by a small hot secondary star that is itself surrounded by an optically thick (large optical depth) disk.[4]
References
- ^ S2CID 119116308.
- ^ .
- ^ a b "AS LMi". The International Variable Star Index. AAVSO. Retrieved 7 December 2021.
- ^ S2CID 24349954.
- Bibcode:2013ATel.4784....1D.
- Bibcode:2013ATel.4787....1N.
- Bibcode:2013ATel.4788....1D.
- Bibcode:2013giec.conf20302T.
