EM Lac
| Simbad link | EM Lac |
|---|---|
| Source publication | Maceroni, C. (1983) - Determination of parameters of W UMa system. IV: BV Dra, BW Dra, EM Lac, SW Lac. |
| ADS link | 1983A&AS...51..435M |
| Name in Source publication | EM Lac |
| Orbital period in days (P [d]) | 0.389133 |
| Mass ratio (q) | 0.63 |
| Mass ratio determination | Photometric |
| Type | W |
| Has total eclipse? | |
| Has spots? | |
| Has third light? | |
| Has period variation? |
| Solver | WD |
|---|---|
| Orbital period in days (P [d]) | 0.389133 |
| Mass ratio (q) | 0.63 |
| Orbital inclination in degrees (i [o]) | 74.4 |
| Fillout (f) | 0.28 |
| Primary temperature in Kelvins (T1 [K]) | 5450 |
| Secondary temperature in Kelvins (T2 [K]) | 5500 |
| Primary polar radius in units of orbital separation (r1p) | 0.4112 |
| Secondary polar radius in units of orbital separation (r2p) | 0.3346 |
| Surface potential (Ω) | 3.0137 |
| Orbital separation in solar radii (a [R]) | |
|---|---|
| Primary radius in solar units (R1 [R]) | |
| Secondary radius in solar units (R2 [R]) | |
| Primary mass in solar units (M1 [M]) | |
| Secondary mass in solar units (M2 [M]) | |
| Primary temperature in kelvins (T1 [K]) | 5450 |
| Secondary temperature in Kelvins (T2 [K]) | 5500 |
| Primary luminosity in solar units (L1 [L]) | |
| Secondary luminosity in solar units (L2 [L]) | |
| Distance in parsecs (d [pc]) | |
| Age in gigayears (τ [gyr]) |
| Orbital period in days (P [d]) | 0.389133 |
|---|---|
| Monotonic period variation in seconds per year (dPdt [s/y]) | 0.007854 |
| Cyclic period variation in years (Pc [y]) | |
| Period study | Qian, Shengbang (2003) - Are overcontact binaries undergoing thermal relaxation oscillation with variable angular momentum loss? |
| ADS link | 2003MNRAS.342.1260Q |
| Designation | Gaia DR2 2004876440123986432 |
|---|---|
| RA | 335:58:41.29176 |
| DEC | 54:01:09.209496 |
| l | 102.2591271 |
| b | -2.823130443 |
| G magnitude | 12.489696 |
| G_bp magnitude | 12.864555 |
| G_rp magnitude | 11.960878 |
| Radial velocity [km/s] | |
| Parallax | 1.805125719 |
| Distance [pc] | 553.978036 |
| Temperature [K] | 5483 |
| Radius [R] | 1.7033993 |
| Luminosity [L] | 2.3626568 |
| Simbad link | EM Lac |
|---|---|
| J magnitude | 11.315 |
| H magnitude | 10.975 |
| K magnitude | 10.957 |
| Johnson_U magnitude | |
| Johnson_B magnitude | 12.2 |
| Johnson_V magnitude | |
| Johnson_R magnitude | |
| Johnson_I magnitude | |
| Sloan_u magnitude | |
| Sloan_g magnitude | 12.4897 |
| Sloan_r magnitude | |
| Sloan_i magnitude | |
| Sloan_z magnitude |