| Revision as of 02:55, 10 November 2024 editAluminiumWithAnI (talk | contribs)Extended confirmed users2,322 edits orbital parametersTag: Visual edit: Switched← Previous edit | Revision as of 10:00, 11 November 2024 edit undoAluminiumWithAnI (talk | contribs)Extended confirmed users2,322 edits stellar parametersNext edit → | ||
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| {{Starbox detail | {{Starbox detail | ||
| |source=<ref name=Harmanec2017/> | |||
| |component1=HD 1976 Aa | |component1=HD 1976 Aa | ||
| |mass={{val|4.71|0.17|0.16}}, {{val|6.45|0.17}}, 6.348<ref name=Gardner2022/> | |||
| |mass= | |||
| |radius={{val|5.74|0.18|0.16}}, {{val|5.24|0.14|0.10}} | |||
| |gravity= | |||
| |gravity={{val|3.59|0.01}}, {{val|3.81|0.01}} | |||
| |metal_fe= | |||
| |temperature= | |temperature={{val|15534|69}}, {{val|16526|100|82}} | ||
| |rotational_velocity= | |rotational_velocity={{val|178|6}}, {{val|170|4}} | ||
| |age_myr= | |||
| |component2=HD 1976 Ab | |component2=HD 1976 Ab | ||
| |mass2=1.31, 1.87, {{val|4.0|0.7}}<ref name=Gardner2022/> | |||
| |mass2= | |||
| |radius2=1.40, 1.82 | |||
| |gravity2= | |gravity2=4.27, 4.18 | ||
| |metal_fe2= | |||
| |temperature2= | |temperature2={{val|6385|565|657}}, {{val|8071|266|352}} | ||
| |rotational_velocity2= | |rotational_velocity2=165 | ||
| |age2_myr= | |||
| }} | }} | ||
| {{Starbox detail|no_heading=y | {{Starbox detail|no_heading=y | ||
| |source=<ref name=Harmanec2017/> | |||
| |component1=HD 1976 B | |component1=HD 1976 B | ||
| |mass={{val|2.65|0.25}}, {{val|6.10|0.27|0.26}} | |||
| |mass= | |||
| |radius={{val|3.40|0.29|0.26}}, {{val|4.48|0.20}} | |||
| |mass_mj= | |||
| |gravity={{val|3.80|0.03}}. {{val|3.92|0.02}} | |||
| |luminosity= | |||
| |temperature={{val|14750|66}}, {{val|13620|154|144}} | |||
| |rotational_velocity={{val|63|9|8}}, {{val|73|6|5}} | |||
| }} | }} | ||
| {{Starbox catalog | {{Starbox catalog | ||
| Line 97: | Line 99: | ||
| {{Starbox end}} | {{Starbox end}} | ||
| '''HD 1976''' is a ] in the deep northern ] of ], approximately {{convert|1100|ly|pc|abbr=off}} from ]. It has the ] '''V746 Cassiopeiae''' (abbreviated to V746 Cas). With an ] of 5.580, the system is faintly visible to the naked eye under dark skies. It consists of an inner pair between a ] and a less massive unknown-type star, which is distantly orbited by another ]. It is currently moving closer towards the ] at a heliocentric ] of −9.70 km/s. | '''HD 1976''' is a ] in the deep northern ] of ], approximately {{convert|1100|ly|pc|abbr=off}} from ]. It has the ] '''V746 Cassiopeiae''' (abbreviated to V746 Cas). With an ] of 5.580, the system is faintly visible to the naked eye under dark skies. It consists of an inner pair between a ] and a less massive unknown-type star, which is distantly orbited by another ]. It is currently moving closer towards the ] at a heliocentric ] of −9.70 km/s. | ||
| ==Stellar properties== | |||
| ==Properties== | |||
| ===HD 1976 Aa=== | |||
| ===HD 1976 Ab=== | |||
| ===HD 1976 B=== | |||
| ==References== | ==References== | ||
| {{reflist|refs= | {{reflist|refs= | ||
| Line 107: | Line 116: | ||
| <ref name=Gardner2022>{{Cite journal | display-authors=3 |doi-access=free|last=Gardner |first=Tyler |last2=Monnier |first2=John D. |last3=Fekel |first3=Francis C. |last4=Le Bouquin |first4=Jean-Baptiste |last5=Scovera |first5=Adam |last6=Schaefer |first6=Gail |last7=Kraus |first7=Stefan |last8=Adams |first8=Fred C. |last9=Anugu |first9=Narsireddy |last10=Berger |first10=Jean-Philippe |last11=Ten Brummelaar |first11=Theo |last12=Davies |first12=Claire L. |last13=Ennis |first13=Jacob |last14=Gies |first14=Douglas R. |last15=Johnson |first15=Keith J. C. |date=2022-11-01 |title=ARMADA. II. Further Detections of Inner Companions to Intermediate-mass Binaries with Microarcsecond Astrometry at CHARA and VLTI |url=https://iopscience.iop.org/article/10.3847/1538-3881/ac8eae |journal=The Astronomical Journal |volume=164 |issue=5 |pages=184 |doi=10.3847/1538-3881/ac8eae |issn=0004-6256}}</ref> | <ref name=Gardner2022>{{Cite journal | display-authors=3 |doi-access=free|last=Gardner |first=Tyler |last2=Monnier |first2=John D. |last3=Fekel |first3=Francis C. |last4=Le Bouquin |first4=Jean-Baptiste |last5=Scovera |first5=Adam |last6=Schaefer |first6=Gail |last7=Kraus |first7=Stefan |last8=Adams |first8=Fred C. |last9=Anugu |first9=Narsireddy |last10=Berger |first10=Jean-Philippe |last11=Ten Brummelaar |first11=Theo |last12=Davies |first12=Claire L. |last13=Ennis |first13=Jacob |last14=Gies |first14=Douglas R. |last15=Johnson |first15=Keith J. C. |date=2022-11-01 |title=ARMADA. II. Further Detections of Inner Companions to Intermediate-mass Binaries with Microarcsecond Astrometry at CHARA and VLTI |url=https://iopscience.iop.org/article/10.3847/1538-3881/ac8eae |journal=The Astronomical Journal |volume=164 |issue=5 |pages=184 |doi=10.3847/1538-3881/ac8eae |issn=0004-6256}}</ref> | ||
| ⚫ | <ref name=Harmanec2017>{{cite journal | display-authors=3 | last=Harmanec | first=P. | last2=Brož | first2=M. | last3=Mayer | first3=P. | last4=Zasche | first4=P. | last5=Kotková | first5=L. | last6=Nemravová | first6=J. A. | last7=Dukes | first7=R. J. | last8=Korčáková | first8=D. | last9=Šlechta | first9=M. | last10=Kıran | first10=E. | last11=Kříček | first11=R. | last12=Juryšek | first12=J. | title=Improved model of the triple system V746 Cassiopeiae that has a bipolar magnetic field associated with the tertiary | journal=Astronomy & Astrophysics | publisher=EDP Sciences | volume=609 | date=2017-12-22 | issn=0004-6361 | doi=10.1051/0004-6361/201628363 | doi-access=free | page=A5}}</ref> | ||
| }} | }} | ||
| Line 112: | Line 123: | ||
| * {{cite journal | last=Docobo | first=J. A. | last2=Costa | first2=J. M. | title=First orbits for the visual double stars ADS 328, ADS 9043, and ADS 13048 | journal=The Astrophysical Journal Supplement Series | publisher=American Astronomical Society | volume=60 | year=1986 | issn=0067-0049 | doi=10.1086/191106 | page=945}} | * {{cite journal | last=Docobo | first=J. A. | last2=Costa | first2=J. M. | title=First orbits for the visual double stars ADS 328, ADS 9043, and ADS 13048 | journal=The Astrophysical Journal Supplement Series | publisher=American Astronomical Society | volume=60 | year=1986 | issn=0067-0049 | doi=10.1086/191106 | page=945}} | ||
| ⚫ | |||
Revision as of 10:00, 11 November 2024
Triple star system in the constellation Cassiopeia
Location of HD 1976 (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cassiopeia |
| Right ascension | 00 24 15.65400 |
| Declination | +52° 01′ 11.7032″ |
| Apparent magnitude (V) | 5.580 (combined) |
| Characteristics | |
| Spectral type | (B5IV + A or F) + B |
| U−B color index | -0.619 |
| B−V color index | -0.121 |
| J−H color index | -0.102 |
| J−K color index | -0.106 |
| Variable type | Slowly pulsating B-type star (A) |
| Astrometry | |
| Radial velocity (Rv) | −9.70 ± 0.49 km/s |
| Proper motion (μ) | RA: 15.504 mas/yr Dec.: -4.061 mas/yr |
| Parallax (π) | 2.4621 ± 0.33 mas |
| Distance | approx. 1,300 ly (approx. 410 pc) |
| Orbit | |
| Primary | HD 1976 Aa |
| Companion | HD 1976 Ab |
| Period (P) | 25.4163±0.0008 d |
| Semi-major axis (a) | 0.42±0.05 mas |
| Eccentricity (e) | 0.05±0.03 |
| Inclination (i) | 100.7±1.2° |
| Longitude of the node (Ω) | 339.9±1.1° |
| Periastron epoch (T) | 59477±5 |
| Argument of periastron (ω) (secondary) | 61±52° |
| Orbit | |
| Primary | HD 1976 A |
| Companion | HD 1976 B |
| Period (P) | 171±3 yr |
| Semi-major axis (a) | 208.0±2.7 mas |
| Eccentricity (e) | 0.162±0.008 |
| Inclination (i) | 62.8±0.4° |
| Longitude of the node (Ω) | 27.8±0.4° |
| Periastron epoch (T) | 33710±679 |
| Argument of periastron (ω) (secondary) | 306.0±4° |
| Details | |
| HD 1976 Aa | |
| Mass | 4.71+0.17 −0.16, 6.45±0.17, 6.348 M☉ |
| Radius | 5.74+0.18 −0.16, 5.24+0.14 −0.10 R☉ |
| Surface gravity (log g) | 3.59±0.01, 3.81±0.01 cgs |
| Temperature | 15534±69, 16526+100 −82 K |
| Rotational velocity (v sin i) | 178±6, 170±4 km/s |
| HD 1976 Ab | |
| Mass | 1.31, 1.87, 4.0±0.7 M☉ |
| Radius | 1.40, 1.82 R☉ |
| Surface gravity (log g) | 4.27, 4.18 cgs |
| Temperature | 6385+565 −657, 8071+266 −352 K |
| Rotational velocity (v sin i) | 165 km/s |
| HD 1976 B | |
| Mass | 2.65±0.25, 6.10+0.27 −0.26 M☉ |
| Radius | 3.40+0.29 −0.26, 4.48±0.20 R☉ |
| Surface gravity (log g) | 3.80±0.03. 3.92±0.02 cgs |
| Temperature | 14750±66, 13620+154 −144 K |
| Rotational velocity (v sin i) | 63+9 −8, 73+6 −5 km/s |
| Other designations | |
| V746 Cassiopeiae, AG+51°39, BD+51°62, Gaia DR3 418916648901801728, GC 476, HD 1976, HIP 1921, HR 91, SAO 21366, PPM 25297, WDS J00243+5201AB, TIC 202418751, TYC 3260-2342-1, GSC 03260-02342, 2MASS J00241564+5201119, | |
| Database references | |
| SIMBAD | HD 1976 |
HD 1976 is a hierarchical triple system in the deep northern constellation of Cassiopeia, approximately 1,100 light-years (340 parsecs) from Earth. It has the variable-star designation V746 Cassiopeiae (abbreviated to V746 Cas). With an apparent magnitude of 5.580, the system is faintly visible to the naked eye under dark skies. It consists of an inner pair between a slowly pulsating B-type star and a less massive unknown-type star, which is distantly orbited by another B-type star. It is currently moving closer towards the Solar System at a heliocentric radial velocity of −9.70 km/s.
Stellar properties
HD 1976 Aa
HD 1976 Ab
HD 1976 B
References
- ^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- ^ Høg, E.; et al. (February 2000). "The Tycho-2 Catalogue of the 2.5 Million Brightest Stars". Astronomy and Astrophysics. 355 (1): L27 – L30. Bibcode:2000A&A...355L..27H.
- ^ "HD 1976". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 10 November 2024.
- ^ Gardner, Tyler; Monnier, John D.; Fekel, Francis C.; et al. (1 November 2022). "ARMADA. II. Further Detections of Inner Companions to Intermediate-mass Binaries with Microarcsecond Astrometry at CHARA and VLTI". The Astronomical Journal. 164 (5): 184. doi:10.3847/1538-3881/ac8eae. ISSN 0004-6256.
- Harmanec, P.; Brož, M.; Mayer, P.; et al. (22 December 2017). "Improved model of the triple system V746 Cassiopeiae that has a bipolar magnetic field associated with the tertiary". Astronomy & Astrophysics. 609. EDP Sciences: A5. doi:10.1051/0004-6361/201628363. ISSN 0004-6361.
- Neiner, C.; Tkachenko, A.; MiMeS collaboration (2014). "Discovery of a magnetic field in the B pulsating system HD 1976". Astronomy & Astrophysics. 563. EDP Sciences: L7. doi:10.1051/0004-6361/201423595. ISSN 0004-6361.
- Docobo, J. A.; Costa, J. M. (1986). "First orbits for the visual double stars ADS 328, ADS 9043, and ADS 13048". The Astrophysical Journal Supplement Series. 60. American Astronomical Society: 945. doi:10.1086/191106. ISSN 0067-0049.