BL Vul
| Simbad link | BL Vul |
|---|---|
| Source publication | Qian, S. -B. (2013) - BI Vulpeculae: A Siamese Twin with Two Very Similar Cool Stars in Shallow Contact |
| ADS link | 2013ApJS..209...13Q |
| Name in Source publication | BL Vul |
| Orbital period in days (P [d]) | 0.251825 |
| Mass ratio (q) | 0.97 |
| 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]) | 0.251825 |
| Mass ratio (q) | 0.97 |
| Orbital inclination in degrees (i [o]) | 76.2 |
| Fillout (f) | 0.09 |
| Primary temperature in Kelvins (T1 [K]) | 4474 |
| Secondary temperature in Kelvins (T2 [K]) | 4600 |
| Primary polar radius in units of orbital separation (r1p) | 0.3653 |
| Secondary polar radius in units of orbital separation (r2p) | 0.3595 |
| Surface potential (Ω) | 3.6453 |
| Orbital separation in solar radii (a [R]) | 1.91 |
|---|---|
| Primary radius in solar units (R1 [R]) | |
| Secondary radius in solar units (R2 [R]) | |
| Primary mass in solar units (M1 [M]) | 0.75 |
| Secondary mass in solar units (M2 [M]) | 0.72 |
| Primary temperature in kelvins (T1 [K]) | 4474 |
| Secondary temperature in Kelvins (T2 [K]) | 4600 |
| 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]) | 0.251825 |
|---|---|
| Monotonic period variation in seconds per year (dPdt [s/y]) | -0.008208 |
| Cyclic period variation in years (Pc [y]) | 10.8 |
| Designation | Gaia DR2 1847120371492690816 |
|---|---|
| RA | 321:57:10.13868 |
| DEC | 26:34:08.565348 |
| l | 76.27998115 |
| b | -17.3373167 |
| G magnitude | 11.986377 |
| G_bp magnitude | 15.631148 |
| G_rp magnitude | 10.073561 |
| Radial velocity [km/s] | |
| Parallax | -0.153546868 |
| Distance [pc] | -6512.669474 |
| Temperature [K] | 3286 |
| Radius [R] | |
| Luminosity [L] |
| Simbad link | BL Vul |
|---|---|
| J magnitude | 6.284 |
| H magnitude | 5.273 |
| K magnitude | 4.586 |
| Johnson_U magnitude | |
| Johnson_B magnitude | |
| Johnson_V magnitude | |
| Johnson_R magnitude | |
| Johnson_I magnitude | |
| Sloan_u magnitude | |
| Sloan_g magnitude | 11.9864 |
| Sloan_r magnitude | |
| Sloan_i magnitude | |
| Sloan_z magnitude |