Delta Delphini
Script error: No such module "Location map". A star chart of the Delphinus constellation showing the position of δ Delphinus (circled) | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Delphinus |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 4.43[2] (4.38 - 4.49)[3] |
| Characteristics | |
| Spectral type | kA7hF1VmF1pSrEuCr:[4] |
| B−V Template:Engvar | +0.302[2] |
| Variable type | δ Sct[3] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[5] km/s |
| Proper motion (μ) | RA: −20.44[1] mas/yr Dec.: −43.33[1] mas/yr |
| Parallax (π) | 14.61±0.20 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | +0.25[6] |
| Orbit[5] | |
| 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".° |
| Periastron epoch (T) | 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 | |
| δ Del A | |
| Mass | 1.78[5] Template:Solar mass |
| Radius | 3.43[5] Template:Solar radius |
| Luminosity | 32.4[5] Template:Solar luminosity |
| Surface gravity (log g) | 3.71[7] cgs |
| Temperature | Script error: No such module "val".[5] K |
| Metallicity [Fe/H] | −0.5[5] dex |
| Rotational velocity (v sin i) | 17[5] km/s |
| Age | 945[7] Myr |
| δ Del B | |
| Mass | 1.62[5] Template:Solar mass |
| Radius | 3.48[5] Template:Solar radius |
| Luminosity | 28.8[5] Template:Solar luminosity |
| Temperature | Script error: No such module "val".[5] K |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Rotational velocity (v sin i) | 12[5] km/s |
| Other designations | |
| Template:Odlist[8] | |
| Database references | |
| SIMBAD | data |
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Delta Delphini, Latinized from δ Delphini, is a binary star[9] in the northern constellation of Delphinus. It is visible to the naked eye with an apparent visual magnitude of 4.43.[2] Based upon an annual parallax shift of 14.61 mas as seen from the Earth,[1] the system is located about 223 light years from the Sun.
This is a double-lined spectroscopic binary[9] system with an orbital period of 40.58 days.[9] The two components are nearly identical chemically peculiar stars, having a combined stellar classification of kA7hF1VmF1pSrEuCr:. This notation indicates the calcium K line matches an A7 star, the hydrogen lines an F1 star, and the metal lines an F1 star, with particularly strong lines of strontium, europium, and chromium. Each of the stars is a Delta Scuti variable, with the system having a dominant period of 0.1568 days and an amplitude of 0.0700 in magnitude.[2] Delta Delphini forms the prototype of a class of metal-lined δ Scuti subgiant or giant stars.[11]
References
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- ↑ Template:Cite simbad
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External links
- Script error: No such module "citation/CS1".