Y Lyncis
 A visual band light curve for Y Lyncis, adapted from Percy et al. (2001).[1] The top panel shows the brightness variation over a period of several years, and the lower panel shows shorter time scale variations. | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lynx |
| Right ascension | 07h 28m 11.61657s[2] |
| Declination | +45° 59′ 26.2295″[2] |
| Apparent magnitude (V) | 6.2 - 8.9[3] |
| Characteristics | |
| Spectral type | M6S Ib[4] |
| Variable type | SRc[4]
|
| Details | |
dex | |
SAO 41784 | |
| Database references | |
| SIMBAD | data |
Y Lyncis is a
semiregular variable star in the constellation Lynx. It is an asymptotic giant branch
star of spectral type M6S, with a luminosity class of Ib, indicating a supergiant luminosity. It is around 1,160 light years away.
Y Lyncis ranges in brightness from magnitude 6.2 to 8.9. Its changes in brightness are complex with at least two different periods showing. The
long secondary period with an amplitude of 0.2 magnitudes and duration 1,300 days. The long secondary period variations are possibly caused by long-lived convection cells.[9]
Y Lyncis has a mass around 1.5-2.0 M☉ and a luminosity around 10,000 L☉. It is a thermally pulsing
asymptotic giant branch star, an evolved star with a carbon-oxygen core that is fusing helium in a shell and hydrogen in a separate shell.[10] It is also an S-type star, where third dredge-ups have brought some carbon to the surface, but not enough to create a carbon star.[6]
References
- S2CID 14609175.
- ^ S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ .
- ^ S2CID 5203133.
- S2CID 119231169.
- ^ S2CID 14294870.
- ^ S2CID 119258214.
- Bibcode:2009yCat....102025S.
- Bibcode:2009JRASC.103...11P.
- S2CID 14294870.
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