Draft:FR Scuti
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| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Scutum |
| Right ascension | 18h 23m 22.79s[1] |
| Declination | −12° 40′ 51.8″[1] |
| Apparent magnitude (V) | +9.79[citation needed] |
| Characteristics | |
| Evolutionary stage | Red supergiant/Bright giant (A) OB stars (BC) |
| Spectral type | M0/2II + 0B[1] |
| B−V color index | 1.64 |
| Astrometry | |
| Radial velocity (Rv) | 42.2 km/s |
| Parallax (π) | 0.4154±0.0667 mas[1] |
| Distance | approx. 8,000 ly (approx. 2,400 pc) |
| Absolute magnitude (MV) | 6.0[citation needed] |
| Details | |
| A | |
| Mass | 0.735+0.075 −0.069 M☉ |
| Radius | 0.011 R☉ |
| Luminosity | 0.0045 L☉ |
| Temperature | 20,000–30,000 K |
| B | |
| Mass | 0.360+0.080 −0.071 M☉ |
| Radius | 0.0661 ± 0.0054 R☉ |
| Luminosity | 1.70+0.31 −0.24 L☉ |
| Temperature | 25,410 ± 370 K |
| Other designations | |
| FR Sct, HIP 90115, TIC 119217144, TYC 5698-2284-1, IRAS 18205-1242, 2MASS J18232280-1240518, SDSS J143900.24+641730.1[2] | |
| Database references | |
| SIMBAD | data |
FR Scuti (also known as FR Sct or HIP 90115) is a variable star located in the constellation of Scutum. It is classified as a symbiotic star of the Z Andromedae type and is notable for being a hierarchical triple system resembling the VV Cephei-type binaries. It consists of a red supergiant primary and a close binary pair of hot OB-type stars.[3]
System
[edit]FR Scuti is a hierarchical triple star system of the VV Cephei type. The primary component is an M-type supergiant, while the secondary is a close binary consisting of two OB-type stars. VV Cephei-type systems are characterized by eclipsing binaries involving a cool supergiant and a hot companion, often showing composite spectra with emission lines. In FR Scuti, the spectrum is peculiar and composite, featuring strong forbidden Fe II emission lines, typical of such systems.
The system's variability and spectral peculiarities were analyzed using data from ASAS, Hipparcos, and other archival photometry to confirm its triple nature.
See also
[edit]Reference
[edit]- ^ a b c d Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR. Cite error: The named reference "dr3" was defined multiple times with different content (see the help page).
- ^ "FR Scuti". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2025-09-04.
- ^ Pigulski, A.; Michalska, G. (February 2007). "FR Scuti: a Triple VV Cephei-type System of Particular Interest". Information Bulletin on Variable Stars. 5757: 1. Bibcode:2007IBVS.5757....1P. ISSN 0374-0676.
