AR Cassiopeiae information

AR Cassiopeiae
	; A light curve for AR Cassiopeiae, plotted from TESS data
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Cassiopeia
	AB
Right ascension	23h 30m 01.93946s
Declination	+58° 32′ 56.1120″
Apparent magnitude (V)	4.883 (4.912 / 8.814)
	CD
Right ascension	23h 29m 52.2802s
Declination	+58° 32′ 54.458″
Apparent magnitude (V)	7.09
Characteristics
AB
Spectral type	B4 V + A6 V
U−B color index	−0.62
B−V color index	−0.12
Variable type	Algol
CD
Spectral type	B9 V
U−B color index	−0.14
B−V color index	+0.01
FG
Spectral type	F7 IV + F9 V
Astrometry
Radial velocity (Rv)	−15.9±0.9 km/s
Proper motion (μ)	RA: 17.90 mas/yr ; Dec.: 4.15 mas/yr
Parallax (π)	5.25 ± 0.52 mas
Distance	620 ± 60 ly ; (190 ± 20 pc)
Aa
Absolute magnitude (MV)	−1.87±0.13
Absolute bolometric; magnitude (Mbol)	−3.56±0.13
Ab
Absolute magnitude (MV)	2.20±0.11
Absolute bolometric; magnitude (Mbol)	2.18±0.11
Orbit
Primary	Aa
Companion	Ab
Period (P)	6.0663170 d
Eccentricity (e)	0.240
Inclination (i)	85.34±0.50°
Periastron epoch (T)	JD 2436847.9404±0.0055
Argument of periastron (ω); (secondary)	41.82±0.47°
Details
Aa
Mass	5.90±0.20 M☉
Radius	5.05±0.06 R☉
Surface gravity (log g)	3.80±0.02 cgs
Temperature	17,200±500 K
Ab
Mass	1.86±0.06 M☉
Radius	1.60±0.03 R☉
Surface gravity (log g)	4.30±0.02 cgs
Temperature	8,150±200 K
Other designations
	ADS 16795, CCDM J23300+5833, WDS J23300+5833
	AR Cassiopeiae (AB): 1H. Cas, AR Cas, BD+57°2748, HD 221253, HIP 115990, HR 8926, SAO 35478
	HD 221237 (CD): BD+57°2747, HD 221237, SAO 35476
	FG: UCAC4 743-089692
Database references
SIMBAD	AR Cas (AB)
	CD
	D
	F
	G

AR Cassiopeiae (AR Cas) is a variable star in the constellation of Cassiopeia. It is thought to be a member of a septuple star system, one of only two known star systems with a multiplicity of 7, the other being Nu Scorpii.^[12]^[9]

^ Cite error: The named reference MAST was invoked but never defined (see the help page).
^ WikiSky, "HD 221253" (accessed 2010-10-27)
^ ^a ^b ^c ^d ^e van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
^ ^a ^b ^c ^d ^e ^f ^g ^h Holmgren, D. E.; Hadrava, P.; Harmanec, P.; Eenens, P.; Corral, L. J.; Yang, S.; Ak, H.; Bozić, H. (1999). "Search for forced oscillations in binaries. III. Improved elements and the detection of line-profile variability of the B4V + A6V: system AR Cassiopeiae". Astronomy and Astrophysics. 345: 855. Bibcode:1999A&A...345..855H.
^ ^a ^b Gaia Collaboration (2016). "Gaia Data Release 1". Astronomy & Astrophysics. 595: A2. arXiv:1609.04172. Bibcode:2016A&A...595A...2G. doi:10.1051/0004-6361/201629512. S2CID 1828208.
^ ^a ^b "HD 221237". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 23 August 2017.
^ ^a ^b ^c ^d Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
^ ^a ^b "V* AR Cas". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 23 August 2017.
^ ^a ^b Cite error: The named reference MSC was invoked but never defined (see the help page).
^ Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Washington. Bibcode:1953GCRV..C......0W.
^ Cite error: The named reference Somerville was invoked but never defined (see the help page).
^ Cite error: The named reference Eggleton was invoked but never defined (see the help page).

[MAST-1] Cite error: The named reference MAST was invoked but never defined (see the help page).

[WikiSky-2] WikiSky, "HD 221253" (accessed 2010-10-27)

[HIP-3] van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.

[Holmgren-4] ^ ^a ^b ^c ^d ^e ^f ^g ^h Holmgren, D. E.; Hadrava, P.; Harmanec, P.; Eenens, P.; Corral, L. J.; Yang, S.; Ak, H.; Bozić, H. (1999). "Search for forced oscillations in binaries. III. Improved elements and the detection of line-profile variability of the B4V + A6V: system AR Cassiopeiae". Astronomy and Astrophysics. 345: 855. Bibcode:1999A&A...345..855H.

[Gaia-5] Gaia Collaboration (2016). "Gaia Data Release 1". Astronomy & Astrophysics. 595: A2. arXiv:1609.04172. Bibcode:2016A&A...595A...2G. doi:10.1051/0004-6361/201629512. S2CID 1828208.

[SimbadCD-6] "HD 221237". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 23 August 2017.

[EgUBV-7] Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.

[SimbadAB-8] "V* AR Cas". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 23 August 2017.

[MSC-9] Cite error: The named reference MSC was invoked but never defined (see the help page).

[GCRV-10] Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Washington. Bibcode:1953GCRV..C......0W.

[Somerville-11] Cite error: The named reference Somerville was invoked but never defined (see the help page).

[Eggleton-12] Cite error: The named reference Eggleton was invoked but never defined (see the help page).

Observation data Epoch J2000.0 Equinox J2000.0
A light curve for AR Cassiopeiae, plotted from TESS data^[1]
Constellation	Cassiopeia^[2]
AB
Right ascension	23^h 30^m 01.93946^s^[3]
Declination	+58° 32′ 56.1120″^[3]
Apparent magnitude (V)	4.883 (4.912 / 8.814)^[4]
CD
Right ascension	23^h 29^m 52.2802^s^[5]
Declination	+58° 32′ 54.458″^[5]
Apparent magnitude (V)	7.09^[6]
Characteristics
AB
Spectral type	B4 V + A6 V^[4]
U−B color index	−0.62^[7]
B−V color index	−0.12^[7]
Variable type	Algol^[8]
CD
Spectral type	B9 V^[6]
U−B color index	−0.14^[7]
B−V color index	+0.01^[7]

FG
Spectral type	F7 IV + F9 V^[9]
Astrometry

Radial velocity (R_v)	−15.9±0.9^[10] km/s
Proper motion (μ)	RA: 17.90^[3] mas/yr Dec.: 4.15^[3] mas/yr
Parallax (π)	5.25 ± 0.52 mas^[3]
Distance	620 ± 60 ly (190 ± 20 pc)


Aa
Absolute magnitude (M_V)	−1.87±0.13^[4]
Absolute bolometric magnitude (M_bol)	−3.56±0.13^[4]
Ab
Absolute magnitude (M_V)	2.20±0.11^[4]
Absolute bolometric magnitude (M_bol)	2.18±0.11^[4]
Orbit^[4]
Primary	Aa
Companion	Ab
Period (P)	6.0663170 d
Eccentricity (e)	0.240
Inclination (i)	85.34±0.50°
Periastron epoch (T)	JD 2436847.9404±0.0055
Argument of periastron (ω) (secondary)	41.82±0.47°
Details^[4]
Aa
Mass	5.90±0.20 `M`_☉
Radius	5.05±0.06 `R`_☉
Surface gravity (log g)	3.80±0.02 cgs
Temperature	17,200±500 K
Ab
Mass	1.86±0.06 `M`_☉
Radius	1.60±0.03 `R`_☉
Surface gravity (log g)	4.30±0.02 cgs
Temperature	8,150±200 K
Other designations
ADS 16795, CCDM J23300+5833, WDS J23300+5833
AR Cassiopeiae (AB): 1H. Cas^[11], AR Cas, BD+57°2748, HD 221253, HIP 115990, HR 8926, SAO 35478^[8]
HD 221237 (CD): BD+57°2747, HD 221237, SAO 35476
FG: UCAC4 743-089692
Database references
SIMBAD	AR Cas (AB)
	CD
	D
	F
	G

AR Cassiopeiae information

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AR Cassiopeiae

Rho Cassiopeiae

Alpha Cassiopeiae

1H

Star system

Eta Cassiopeiae

Gamma Cassiopeiae

Cassiopeia A

Beta Cassiopeiae

V762 Cassiopeiae

Delta Cassiopeiae

Alpha Lacertae

9 Cassiopeiae

Psi Andromedae

Tau Cassiopeiae

Nu Scorpii

Beta Lacertae

SN 1572

Gamma Cassiopeiae variable

Omicron Cassiopeiae

S Cassiopeiae

Kappa Andromedae

Sigma Cassiopeiae

Epsilon Cassiopeiae

Nu Cassiopeiae

Mu Cassiopeiae

Kappa Cassiopeiae

Phi Cassiopeiae

AO Cassiopeiae