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 - 2026 		#notes
1 V* TV Cas SB* 00 19 18.7425324624 +59 08 20.546623392 7.27 7.29 7.22     B9V 278 0
2 HD 5679 SB* 01 02 18.4439850768 +81 52 32.081564352   6.92 6.92     G2III:+B8/9 476 0
3 V* X Tri SB* 02 00 33.7371929520 +27 53 19.206276360   9.30 9.00 8.50   A7V 230 0
4 V* RY Per SB* 02 45 42.1225182912 +48 08 37.891142448   8.69 8.63     B4+F5III 160 0
5 V* RZ Cas SB* 02 48 55.5102370536 +69 38 03.441502644   6.40 6.26     A3V 471 0
6 HD 18541 SB* 03 00 05.7099353256 +39 11 24.909338004   9.83 9.61 9.62   A3V+K1-2IV 135 0
7 * bet Per SB* 03 08 10.1324535 +40 57 20.328013 1.70 2.07 2.12 2.08 2.11 B8V 1265 1
8 V* T Tau TT* 04 21 59.4319873992 +19 32 06.432393336   11.22 10.12 9.80   K0IV/Ve 1456 1
9 HD 269696 HS* 05 31 40.3594532592 -69 53 02.153902236 9.74 10.92 11.15     sdB+dM 202 0
10 V* RW Gem SB* 06 01 28.0583295504 +23 08 27.520477836   9.89 9.79     B6V 105 0
11 V* RY Gem SB* 07 27 24.1728227544 +15 39 34.699185396   8.88 8.68     A0V:e+K0II 151 0
12 V* RX Hya SB* 09 05 41.1659800536 -08 15 39.730576860   9.78 9.56     A5III 105 0
13 V* Y Leo SB* 09 36 51.8061174072 +26 13 57.634814352   10.31 10.07     A3 133 0
14 V* TX UMa SB* 10 45 20.5041244512 +45 33 58.708181052   6.99 6.98     B8V+G0III-IV 291 0
15 * del Lib SB* 15 00 58.3483018872 -08 31 08.210408772 4.82 4.93 4.93 4.85 4.84 A0V 305 0
16 V* W UMi SB* 16 08 27.2683602360 +86 11 59.550808020   8.92 8.65     A2V 121 0
17 V* V1010 Oph SB* 16 49 27.6690355320 -15 40 04.682052912   6.40 6.19     A3V 158 0
18 V* AI Dra SB* 16 56 18.1527589608 +52 41 54.348391608   7.18 7.13     A0V 186 0
19 V* RZ Sct SB* 18 26 33.5232714792 -09 12 05.987275200 8.09 8.24 7.53     B2/3Ib/II 176 0
20 * bet Lyr SB* 18 50 04.7951442356 +33 21 45.600371200 2.85 3.42 3.42 3.31 3.29 B8.5Ib-II 955 0
21 V* DI Her SB* 18 53 26.2399243224 +24 16 40.792648332   8.46 8.47     B5III 274 0
22 * U Sge SB* 19 18 48.4082723376 +19 36 37.722978540 6.23 6.61 6.58     B7III+K1III 385 0
23 V* V1143 Cyg SB* 19 38 41.1829269072 +54 58 25.647010572       5.6   F6Va 229 0
24 V* V505 Sgr SB* 19 53 06.3860220576 -14 36 11.488005972   6.62 6.48     A2IV-V 213 0
25 V* WW Cyg SB* 20 04 02.7108881088 +41 35 16.462624380   10.163 10.10   9.875 B8k:+G? 118 0
26 V* SW Cyg SB* 20 06 57.9309043632 +46 17 58.151017284   9.57 9.35     A2 172 0
27 * 71 Dra SB* 20 19 36.7272071568 +62 15 26.797556412   5.660 5.709     B9V 83 0
28 V* W Del SB* 20 37 40.0858816920 +18 17 03.755963580   9.89 9.81     A0 152 0
29 V* AQ Peg SB* 21 37 20.9053929288 +13 28 28.499048292   10.57 10.47     kA2hA7mA8 80 0
30 V* NY Cep SB* 22 58 39.7987260456 +63 04 37.752984732 7.23 7.74 7.4     B5 160 0
31 V* Y Psc SB* 23 34 25.3846714008 +07 55 28.524147636   9.62 9.40     A3V+K0 111 0

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