| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Phoenix |
| Right ascension | 01h 50m 54.44s[2] |
| Declination | −50° 12′ 22.09″[2] |
| Apparent magnitude (V) | 5.90 – 5.94[3] |
| Characteristics | |
| Spectral type | A1Va λ Boo[4] |
| Variable type | δ Scuti[3] |
| Astrometry | |
| Radial velocity (Rv) | 3.0[5] km/s |
| Proper motion (μ) | RA: -47.85[2]mas/yr Dec.: -3.70[2]mas/yr |
| Parallax (π) | 12.7260±0.0447 mas[2] |
| Distance | 256.3 ± 0.9 ly (78.6 ± 0.3 pc) |
| Absolute magnitude (MV) | 1.5 ± 0.1[1] |
| Details | |
| Mass | 2.02 ± 0.04[1] M☉ |
| Luminosity | 20.5 ± 0.34[6] L☉ |
| Surface gravity (log g) | 3.91 ± 0.08[1] cgs |
| Temperature | 7,818 ± 38[6] K |
| Rotational velocity (v sin i) | 120 ± 5[1] km/s |
| Age | 813+38 −89[1] Myr |
| Other designations | |
| BD Phe,CD−50°514,HD 11413,HIP 8593,HR 541,SAO 232542[7] | |
| Database references | |
| SIMBAD | data |
BD Phoenicis is avariable star in theconstellation ofPhoenix. Fromparallax measurements by theGaia spacecraft, it is located at a distance of 256light-years (78parsecs) from Earth.[2] Itsabsolute magnitude is calculated at 1.5.[1]
BD Phoenicis is aLambda Boötis star, an uncommon type ofpeculiar stars that have very low abundances of iron-peak elements. In particular, BD Phoenicis has near-solar carbon and oxygen content, but its iron abundance is only 4% of the solar value.[1] BD Phoenicis is also a pulsating variable ofDelta Scuti type, varying its apparent magnitude between 5.90 and 5.94.[3] A study of itslight curve detected seven pulsation periods that range from 50 to 84 minutes, the strongest one having a period of 57 minutes and an amplitude of 9 milli-magnitudes. Pulsations are common among Lambda Boötis stars and seem to be more common than normal main sequence stars of the same spectral type.[1]
BD Phoenicis is anA-type main-sequence star with aspectral type of A1Va.[4]Stellar evolution models indicate it contains double thesolar mass and an age of about 800 million years—having completed 83% of itsmain sequence lifetime.[1] It is radiating 21 times theSun's luminosity from itsphotosphere at aneffective temperature of7800 K.[6] BD Phoenicis has a composite spectra that indicate it is abinary star, but nothing is known about its companion.[8][6]
Observations by theHerschel Space Observatory have detected aninfrared excess from BD Phoenicis, indicating that there is adebris disk in the system. By modeling the emission as ablack body, it is estimated that the dust has a temperature of55±2 K and is at a distance of118±10 au from the star. The existence of debris disks is possibly related to the Lambda Boötis phenomenon.[6]
