Coordinates

RA	01h 18m 02.70 s	Dec	+65° 17' 29.9"
RA	19.511238	Dec	65.291625
l	125.709978	b	2.563493

Binary system

Distance: 5.9 ± 1.4 kpc ^[1]

Orbit

Parameter	Value	Unit	Reference
P_orb	11.5983±0.0006	days	^[2]
T₀	2451825.3±0.5	HJD	^[2]
a sin i	3.16±0.16	lt-sec	^[2]
e	0.18±0.05		^[2]
ω	51±17		^[2]

Optical Companion

V662 Cas, LS I +65 010, HIP 6081, ALS 6517

Stellar type: B1 Ia (16 M_sol, 37 R_sol) ^[3]

Available data from pointing instruments

RXTE: 12 ~10 ks observations in 1996 and 31 of varying duration 2005
Swift-XRT: 4 observations of ~5 ks from 30 Jan to 1 Feb 2009
XMM-Newtown: 1 observation of 49 ks in 2015

Description

2S 0114+650 was discovered in 1977 by SAS3. Its extremely long pulse period of close to 10,000s puzzled observers at first. It also presents a 30.7 day superorbital modulation.

References

↑ Reig, P., & Fabregat, J. 2015, A&A, 574, A33 (NASA ADS)
↑ ^2.0 ^2.1 ^2.2 ^2.3 ^2.4 Grundstrom, E. D.; Blair, J. L.; Gies, D. R.; et al., 2007, ApJ 656, 431 (NASA ADS)
↑ Reig, P., Chakrabarty, D., Coe, M. J., et al. 1996, A&A, 311, 879 (NASA ADS)

[ReigFabregat15-1] Reig, P., & Fabregat, J. 2015, A&A, 574, A33 (NASA ADS)

[Grundstrom07-2] 2.0 ^2.1 ^2.2 ^2.3 ^2.4 Grundstrom, E. D.; Blair, J. L.; Gies, D. R.; et al., 2007, ApJ 656, 431 (NASA ADS)

[Reig96-3] Reig, P., Chakrabarty, D., Coe, M. J., et al. 1996, A&A, 311, 879 (NASA ADS)

[1]

[2]

[3]

3A 0114+650

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