2011ApJ...726...68A

Query : 2011ApJ...726...68A

2011ApJ...726...68A - Astrophys. J., 726, 68 (2011/January-2)

The banana project. III. Spin-orbit alignment in the long-period eclipsing binary NY Cephei.

ALBRECHT S., WINN J.N., CARTER J.A., SNELLEN I.A.G. and DE MOOIJ E.J.W.

Abstract (from CDS):

Binaries are not always neatly aligned. Previous observations of the DI Her system showed that the spin axes of both stars are highly inclined with respect to one another and the orbital axis. Here, we report on a measurement of the spin-axis orientation of the primary star of the NY Cep system, which is similar to DI Her in many respects: it features two young early-type stars (∼6 Myr, B0.5V+B2V), in an eccentric and relatively long-period orbit (e = 0.48, P = 15.<SUP>d</SUP>3). The sky projections of the rotation vector and the spin vector are well aligned (βp= 2°±4°), in strong contrast to DI Her. Although no convincing explanation has yet been given for the misalignment of DI Her, our results show that the phenomenon is not universal, and that a successful theory will need to account for the different outcome in the case of NY Cep.

Abstract Copyright: ∼

Journal keyword(s): stars: early-type - stars: formation - stars: individual: NY Cep - stars: kinematics and dynamics - stars: rotation - techniques: spectroscopic

Simbad objects: 31

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Number of rows : 31
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 V* TV Cas EB* 00 19 18.7425324624 +59 08 20.546623392 7.27 7.29 7.22     B9V 271 0
2 V* U Cep EB* 01 02 18.4439850768 +81 52 32.081564352   6.92 6.92     G2III:+B8/9 467 0
3 V* X Tri EB* 02 00 33.7371929520 +27 53 19.206276360   9.30 9.00 8.50   A7V 225 0
4 V* RY Per EB* 02 45 42.1225182912 +48 08 37.891142448   8.69 8.63     B4+F5III 153 0
5 V* RZ Cas EB* 02 48 55.5102370536 +69 38 03.441502644   6.40 6.26     A3V 456 0
6 HD 18541 EB* 03 00 05.7099353256 +39 11 24.909338004   9.83 9.61 9.62   A3V+K1-2IV 133 0
7 * bet Per EB* 03 08 10.1324535 +40 57 20.328013 1.70 2.07 2.12 2.08 2.11 B8V 1219 1
8 V* T Tau TT* 04 21 59.4319873992 +19 32 06.432393336   11.22 10.12 9.80   K0IV/Ve 1404 1
9 HD 269696 HS* 05 31 40.3594532592 -69 53 02.153902236 9.74 10.92 11.15     sdB+dM 193 0
10 V* RW Gem EB* 06 01 28.0583295504 +23 08 27.520477836   9.89 9.79     B6V 102 0
11 V* RY Gem EB* 07 27 24.1728227544 +15 39 34.699185396   8.88 8.68     A0V:e+K0II 145 0
12 V* RX Hya EB* 09 05 41.1659800536 -08 15 39.730576860   9.78 9.56     A5III 101 0
13 V* Y Leo EB* 09 36 51.8061174072 +26 13 57.634814352   10.31 10.07     A3 129 0
14 V* TX UMa EB* 10 45 20.5041244512 +45 33 58.708181052   6.99 6.98     B8V+G0III-IV 282 0
15 * del Lib EB* 15 00 58.3483018872 -08 31 08.210408772 4.82 4.93 4.93 4.85 4.84 A0V 293 0
16 V* W UMi EB* 16 08 27.2683602360 +86 11 59.550808020   8.92 8.65     A2V 117 0
17 V* V1010 Oph EB* 16 49 27.6690355320 -15 40 04.682052912   6.40 6.19     A3V 149 0
18 V* AI Dra EB* 16 56 18.1527589608 +52 41 54.348391608   7.18 7.13     A0V 181 0
19 V* RZ Sct EB* 18 26 33.5232714792 -09 12 05.987275200 8.09 8.24 7.53     B2/3Ib/II 170 0
20 * bet Lyr EB* 18 50 04.7951442356 +33 21 45.600371200 2.85 3.42 3.42 3.31 3.29 B8.5Ib-II 926 0
21 V* DI Her EB* 18 53 26.2399243224 +24 16 40.792648332   8.46 8.47     B5III 265 0
22 * U Sge EB* 19 18 48.4082723376 +19 36 37.722978540 6.23 6.61 6.58     B7III+K1III 373 0
23 V* V1143 Cyg EB* 19 38 41.1829269072 +54 58 25.647010572       5.6   F6Va 220 0
24 V* V505 Sgr EB* 19 53 06.3860220576 -14 36 11.488005972   6.62 6.48     A2IV-V 207 0
25 V* WW Cyg EB* 20 04 02.7108881088 +41 35 16.462624380   10.163 10.10   9.875 B8k:+G? 113 0
26 V* SW Cyg EB* 20 06 57.9309043632 +46 17 58.151017284   9.57 9.35     A2 166 0
27 * 71 Dra EB* 20 19 36.7272071568 +62 15 26.797556412   5.660 5.709     B9V 79 0
28 V* W Del EB* 20 37 40.0858816920 +18 17 03.755963580   9.89 9.81     A0 148 0
29 V* AQ Peg EB* 21 37 20.9053929288 +13 28 28.499048292   10.57 10.47     A7: 75 0
30 V* NY Cep EB* 22 58 39.7987260456 +63 04 37.752984732 7.23 7.74 7.4     B5 153 0
31 V* Y Psc EB* 23 34 25.3846714008 +07 55 28.524147636   9.62 9.40     A3V+K0 107 0

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