36 Lyncis
Star in the constellation Lynx
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36 Lyncis is a solitary[10] variable star located around 620 light years away from the Sun in the northern constellation of Lynx. It has the variable star designation of EI Lyncis, while 36 Lyncis is the Flamsteed designation. This object is visible to the naked eye as a dim, blue-white hued star with an apparent visual magnitude of 5.30.[2] It is moving further away from the Earth with a heliocentric radial velocity of 21 km/s.[2]
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lynx |
| Right ascension | 09h 13m 48.21318s[1] |
| Declination | +43° 13′ 04.1940″[1] |
| Apparent magnitude (V) | 5.30[2] |
| Characteristics | |
| Evolutionary stage | main sequence[3][1] |
| Spectral type | B9IVpHgMn[4] |
| B−V color index | −0.130±0.003[2] |
| Variable type | SX Ari[5] |
| Astrometry | |
| Radial velocity (Rv) | 21.3±1.7[2] km/s |
| Proper motion (μ) | RA: −30.236[1] mas/yr Dec.: −32.032[1] mas/yr |
| Parallax (π) | 5.2687±0.1577 mas[1] |
| Distance | 620 ± 20 ly (190 ± 6 pc) |
| Absolute magnitude (MV) | −0.95[2] |
| Details | |
| Mass | 4.2[1] M☉ |
| Radius | 3.4[3] R☉ |
| Luminosity | 505[1] L☉ |
| Surface gravity (log g) | 3.65[6] cgs |
| Temperature | 13,700[6] K |
| Metallicity [Fe/H] | +0.60[6] dex |
| Rotation | 3.83476±0.00004 d[7] |
| Rotational velocity (v sin i) | 49±1[7] km/s |
| Age | 79-110[3] Myr |
| Other designations | |
| 36 Lyn, EI Lyn, BD+43°1893, FK5 346, HD 79158, HIP 45290, HR 3652, SAO 42759[8] | |
| Database references | |
| SIMBAD | data |
This is a magnetic, helium-weak Bp star[11][12] with a stellar classification of B9IVpHgMn,[4] although the spectral peculiarities have led to alternate classifications such as B8 IIImnp.[7] It is sometimes classified as a mercury-manganese star.[13] It is also an 'sn' star, displaying a spectrum with generally sharp lines for most elements in combination with broad, diffuse lines of helium.[14] 36 Lyncis has been classified as an SX Arietis variable[15] with an amplitude of 0.03 in visual magnitude and a rotationally-modulated period of 3.834 days.[5] The star is spinning with a projected rotational velocity of 49 km/s[7] and a rotation rate of 3.83476 days.[7] It has 3.4 times the Sun's radius[3] and is radiating 505 times the luminosity of the Sun from its photosphere at an effective temperature of 13,700 K.[6]