V781 Tau
| Simbad link | V781 Tau |
|---|---|
| Source publication | Lu, Hong-peng (2020) - Magnetic Activity and Period Variation Studies of the Four W Uma-type Eclipsing Binaries: UV Lyn, V781 Tau, NSVS 4484038, and 2MASS J15471055+5302107 |
| ADS link | 2020ApJ...901..169L |
| Name in Source publication | V781 Tau |
| Orbital period in days (P [d]) | 0.344909 |
| Mass ratio (q) | 2.47 |
| Mass ratio determination | Spectroscopic |
| Temperature determination | Spectral type |
| Type | Unspecified |
| Has total eclipse? | |
| Has spots? | |
| Has third light? | |
| Has period variation? | |
| Search TESS catalog of Eclipsing Binaries | TIC 76873464 |
| Solver | WD |
|---|---|
| Orbital period in days (P [d]) | 0.344909 |
| Mass ratio (q) | 2.47 |
| Orbital inclination in degrees (i [o]) | 65.9 |
| Fillout (f) | 0.27 |
| Primary temperature in Kelvins (T1 [K]) | 6000 |
| Secondary temperature in Kelvins (T2 [K]) | 5536 |
| Primary polar radius in units of orbital separation (r1p) | 0.3 |
| Secondary polar radius in units of orbital separation (r2p) | 0.4 |
| Surface potential (Ω) | 5.744 |
| Orbital separation in solar radii (a [R]) | 2.36 |
|---|---|
| Primary radius in solar units (R1 [R]) | 0.76 |
| Secondary radius in solar units (R2 [R]) | 1.13 |
| Primary mass in solar units (M1 [M]) | 0.43 |
| Secondary mass in solar units (M2 [M]) | 1.06 |
| Primary temperature in kelvins (T1 [K]) | 6000 |
| Secondary temperature in Kelvins (T2 [K]) | 5536 |
| 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]) | 0.344909 |
|---|---|
| Monotonic period variation in seconds per year (dPdt [s/y]) | -0.003283 |
| Cyclic period variation in years (Pc [y]) | 30.9 |
| Host | Longitude λ [o] | Latitude β [o] | Angular radius σ [o] | Temperature contrast Tspot/Tstar |
|---|---|---|---|---|
| Secondary | 359.5 | 19.9 | 1.08309 |
| Designation | Gaia DR3 3430968898528864768 |
|---|---|
| RA | 87:33:15.453256 |
| DEC | 26:57:41.980711 |
| l | 182.2150028188788 |
| b | -0.15169605608010414 |
| G [mag] | 8.623254 |
| G_bp [mag] | 8.929437 |
| G_rp [mag] | 8.121147 |
| Parallax | 12.491114261829207 |
| Distance [pc] | 79.8258 |
| Temperature [K] | 5640.468 |
| Surface gravity log(g) [cm/s2] | 4.2138 |
| Metallicity [Fe/H] | -0.6594 |
| Monochromatic extinction A0 [mag] | 0.0006 |
| Radius [R] | 1.3007513 |
| Luminosity [L] | 1.7220521 |
| Simbad link | V781 Tau |
|---|---|
| J magnitude | 7.436 |
| H magnitude | 7.15 |
| K magnitude | 7.092 |
| Johnson_U magnitude | |
| Johnson_B magnitude | 9.28 |
| Johnson_V magnitude | 8.67 |
| Johnson_R magnitude | |
| Johnson_I magnitude | 7.976 |
| Sloan_u magnitude | |
| Sloan_g magnitude | |
| Sloan_r magnitude | |
| Sloan_i magnitude | |
| Sloan_z magnitude |