HR 273 information

HR 273
	Location of HR 273 (circled)
Observation data; Epoch J2000 Equinox J2000
Constellation	Cassiopeia
Right ascension	00h 58m 31.06245s
Declination	+66° 21′ 06.4522″
Apparent magnitude (V)	5.97
Characteristics
Spectral type	A0 III
U−B color index	−0.13
B−V color index	−0.02
Astrometry
Radial velocity (Rv)	−10.3 km/s
Proper motion (μ)	RA: +43.81 mas/yr ; Dec.: −13.62 mas/yr
Parallax (π)	9.31 ± 0.33 mas
Distance	350 ± 10 ly ; (107 ± 4 pc)
Absolute magnitude (MV)	0.3
Orbit
Period (P)	6.82054 days
Eccentricity (e)	0
Inclination (i)	20.5°
Semi-amplitude (K1); (primary)	24.60 km/s
Semi-amplitude (K2); (secondary)	38.43 km/s
Details
A
Mass	2.5 M☉
Surface gravity (log g)	4.0 cgs
Temperature	11,400 K
B
Surface gravity (log g)	4.5 cgs
Temperature	7,800 K
Rotational velocity (v sin i)	3.2+0.3; −1.9 km/s
Other designations
	HR 273, HD 5550, HIP 4572, BD+65°115
Database references
SIMBAD	data

HR 273 is a chemically peculiar spectroscopic binary system in the northern circumpolar constellation of Cassiopeia. It has an apparent visual magnitude of 5.9 making it faintly visible to the naked eye from dark suburban skies. Parallax measurements with the Hipparcos spacecraft put this system at a distance of roughly 350 light years.^[1]

The primary, HR 273 A, is an Ap star^[8] and the secondary is an Am star, making this a very unusual binary system. The primary has a magnetic field of 65 gauss, amongst the weakest seen in any Ap star. The magnetic field in the secondary is too weak to detect.^[7]

Component A has a spectral type of A0 III, and has unusually strong lines of strontium, chromium, and europium so it is known as a SrCrEu star.^[6] Although some spectral lines of the secondary star can be clearly distinguished, its spectral type cannot be clearly assigned. It is thought to be a late class A star, cooler than the primary. The primary star has been rotationally braked so that its rotational period closely matches its orbital period.^[7]

^ ^a ^b ^c ^d ^e ^f Cite error: The named reference hipparcos was invoked but never defined (see the help page).
^ ^a ^b ^c Cite error: The named reference ducati was invoked but never defined (see the help page).
^ Cite error: The named reference cowley was invoked but never defined (see the help page).
^ Cite error: The named reference gcsrv was invoked but never defined (see the help page).
^ Cite error: The named reference gomez was invoked but never defined (see the help page).
^ ^a ^b ^c Cite error: The named reference carrier was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e ^f ^g Cite error: The named reference alecian was invoked but never defined (see the help page).
^ Cite error: The named reference renson was invoked but never defined (see the help page).

[hipparcos-1] ^ ^a ^b ^c ^d ^e ^f Cite error: The named reference hipparcos was invoked but never defined (see the help page).

[ducati-2] Cite error: The named reference ducati was invoked but never defined (see the help page).

[cowley-3] Cite error: The named reference cowley was invoked but never defined (see the help page).

[gcsrv-4] Cite error: The named reference gcsrv was invoked but never defined (see the help page).

[gomez-5] Cite error: The named reference gomez was invoked but never defined (see the help page).

[carrier-6] Cite error: The named reference carrier was invoked but never defined (see the help page).

[alecian-7] ^ ^a ^b ^c ^d ^e ^f ^g Cite error: The named reference alecian was invoked but never defined (see the help page).

[renson-8] Cite error: The named reference renson was invoked but never defined (see the help page).

Observation data Epoch J2000 Equinox J2000
Location of HR 273 (circled)
Constellation	Cassiopeia
Right ascension	00^h 58^m 31.06245^s^[1]
Declination	+66° 21′ 06.4522″^[1]
Apparent magnitude (V)	5.97^[2]
Characteristics
Spectral type	A0 III^[3]
U−B color index	−0.13^[2]
B−V color index	−0.02^[2]
Astrometry

Radial velocity (R_v)	−10.3^[4] km/s
Proper motion (μ)	RA: +43.81^[1] mas/yr Dec.: −13.62^[1] mas/yr
Parallax (π)	9.31 ± 0.33 mas^[1]
Distance	350 ± 10 ly (107 ± 4 pc)
Absolute magnitude (M_V)	0.3^[5]

Orbit^[6]
Period (P)	6.82054 days
Eccentricity (e)	0
Inclination (i)	20.5°
Semi-amplitude (K₁) (primary)	24.60 km/s
Semi-amplitude (K₂) (secondary)	38.43 km/s
Details
A
Mass	2.5^[6] `M`_☉
Surface gravity (log g)	4.0^[7] cgs
Temperature	11,400^[7] K
B
Surface gravity (log g)	4.5^[7] cgs
Temperature	7,800^[7] K
Rotational velocity (v sin i)	3.2+0.3 −1.9^[7] km/s
Other designations
HR 273, HD 5550, HIP 4572, BD+65°115
Database references
SIMBAD	data

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