Psi Centauri
Template:Location mark Location of ψ Centauri (circled) | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Centaurus |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | +4.05[2] |
| Characteristics | |
| Spectral type | A0 IV[3] (B9 and A2)[4] |
| U−B Template:Engvar | −0.11[3] |
| B−V Template:Engvar | −0.03[3] |
| Variable type | eclipsing[4] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[5] km/s |
| Proper motion (μ) | RA: Script error: No such module "val".[1] mas/yr Dec.: Script error: No such module "val".[1] mas/yr |
| Parallax (π) | 13.049±0.063 mas[6] |
| Distance | Script error: No such module "val". ly (Script error: No such module "val". pc)[6] |
| Absolute magnitude (MV) | Script error: No such module "val".[7] |
| Orbit[6] | |
| Period (P) | Script error: No such module "val". |
| Semi-major axis (a) | Script error: No such module "val". |
| Eccentricity (e) | Script error: No such module "val". |
| Inclination (i) | Script error: No such module "val".° |
| Longitude of the node (Ω) | Script error: No such module "val".° |
| Argument of periastron (ω) (secondary) | Script error: No such module "val".° |
| Semi-amplitude (K1) (primary) | Script error: No such module "val". km/s |
| Semi-amplitude (K2) (secondary) | Script error: No such module "val". km/s |
| Details[6] | |
| ψ Cen A | |
| Mass | Script error: No such module "val". Template:Solar mass |
| Radius | Script error: No such module "val". Template:Solar radius |
| Luminosity | Script error: No such module "val". Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val".[8] cgs |
| Temperature | Script error: No such module "val". K |
| Metallicity [Fe/H] | +Script error: No such module "val". dex |
| Rotation | Script error: No such module "val".[4] |
| Rotational velocity (v sin i) | 123.7[8] km/s |
| Age | Script error: No such module "val". Myr |
| ψ Cen B | |
| Mass | Script error: No such module "val". Template:Solar mass |
| Radius | Script error: No such module "val". Template:Solar radius |
| Luminosity | Script error: No such module "val". Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val".[8] cgs |
| Temperature | Script error: No such module "val". K |
| Metallicity [Fe/H] | +Script error: No such module "val". dex |
| Rotational velocity (v sin i) | 126.9[8] km/s |
| Age | Script error: No such module "val". Myr |
| Other designations | |
| Template:Odlist[9] | |
| Database references | |
| SIMBAD | data |
Script error: No such module "Check for unknown parameters".
Psi Centauri, which is Latinized from ψ Centauri, is a binary star[10] system in the southern constellation of Centaurus. It is visible to the naked eye with a baseline apparent visual magnitude of +4.05.[2] The distance to this system is 250 light years based on parallax.[6] The radial velocity is poorly constrained, but it appears to be slowly drifting away from the Sun at the rate of +2 km/s.[5]
This is a detached eclipsing binary system with the secondary eclipse being total.[4] The pair are orbiting each other with a period of 38.81 days and an eccentricity of 0.55.[6]The brightness of the system dips by 0.28 and 0.16 magnitude during the two eclipses per orbit.[4] The system displays an infrared excess at a wavelength of 60 μm, indicating the presence of a circumstellar debris disk with a temperature of 120 K, orbiting at a distance of 64 AU.[11]
The pair have a combined stellar classification of A0 IV,[3] matching a white-hued A-type subgiant.[2] The two components appear to be at different evolutionary stages.[4] Both have high rotation rates, with projected rotational velocities over 120 km/s.[8] The primary has 3.814 times the Sun's radius while the secondary is 1.896 times.[6] The primary showed evidence of pulsational behavior with 1.996 and 5.127 cycles per day,[4] which suggests it is a slowly pulsating B star.[8] But this remains unconfirmed as of 2017,[12] and the finding may instead be the result of instrumental error.[8]
References
<templatestyles src="Reflist/styles.css" />
- ↑ a b c d Script error: No such module "citation/CS1". Vizier catalog entry
- ↑ a b c Script error: No such module "citation/CS1".
- ↑ a b c d Script error: No such module "citation/CS1".
- ↑ a b c d e f g h Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ a b c d e f g Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ a b c d e f g Script error: No such module "citation/CS1".
- ↑ Template:Cite simbad
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
Script error: No such module "Check for unknown parameters".