2024ApJ...972..103B

Query : 2024ApJ...972..103B

2024ApJ...972..103B - Astrophys. J., 972, 103 (2024/September-1)

ϵ Sagittarii: An Extreme Rapid Rotator with a Decretion Disk.

BAILEY J., LEWIS F., HOWARTH I.D., COTTON D.V., MARSHALL J.P. and KEDZIORA-CHUDCZER L.

Abstract (from CDS):

We report high-precision, multiwavelength linear-polarization observations of the bright B9 (or A0) star ϵ Sagittarii. The polarization shows the distinctive wavelength dependence expected for a rapidly rotating star. Analysis of the polarization data reveals an angular rotation rate ω (=Ω/Ωcrit) of 0.995 or greater, the highest yet measured for a star in our Galaxy. An additional wavelength-independent polarization component is attributed to electron scattering in a low-density, edge-on gas disk that also produces the narrow absorption components seen in the spectrum. Several properties of the star (polarization due to a disk, occasional weak Hα emission, and multiple periodicities seen in space photometry) resemble those of Be stars, but the level of activity in all cases is much lower than that of typical Be stars. The stellar properties are inconsistent with single-rotating-star evolutionary tracks, indicating that it is most likely a product of binary interaction. The star is an excellent candidate for observation by interferometry, optical spectropolarimetry to detect the Öhman effect, and ultraviolet polarimetry, any of which would allow its extreme rotation to be tested and its stellar properties to be refined.

Abstract Copyright: © 2024. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Polarimetry - Stellar rotation - Circumstellar disks

Simbad objects: 60

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Number of rows : 60
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 * bet Hyi PM* 00 25 45.07036 -77 15 15.2860 3.52 3.41 2.79 2.28 1.94 G0V 631 0
2 * alf Eri Be* 01 37 42.84548 -57 14 12.3101 -0.36 0.30 0.46 0.49 0.60 B6Vpe 495 1
3 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
4 VFTS 285 * 05 38 17.3293080024 -69 05 42.046651680   15.57 15.63     O7.5Vnnn 21 0
5 * alf CMi SB* 07 39 18.11950 +05 13 29.9552 0.82 0.79 0.37 -0.05 -0.28 F5IV-V+DQZ 1925 0
6 * l Car cC* 09 45 14.8117044917 -62 30 28.450312664   5.09 3.75     G5Iab/b 343 0
7 * alf Leo PM* 10 08 22.31099 +11 58 01.9516 0.88 1.24 1.40 1.37 1.47 B8IVn 891 1
8 * bet Leo dS* 11 49 03.57834 +14 34 19.4090 2.30 2.22 2.13 2.08 2.06 A3Va 605 1
9 * bet Vir PM* 11 50 41.7185158616 +01 45 53.001539131 4.26 4.15 3.60 3.13 2.85 F9V 973 0
10 HD 111613 sg* 12 51 17.9760267672 -60 19 47.240368104 6.00 6.10 5.72 5.32 5.03 B9.5Iab 123 0
11 * alf Ser PM* 15 44 16.0741095811 +06 25 32.268792881 5.080 3.800 2.630 1.82 1.25 K2IIIbCN1 533 0
12 HD 143114 PM* 15 59 38.2680735360 -29 37 57.205518456   7.94 7.33     G0+V 101 0
13 HD 144766 PM* 16 08 07.1233139832 -18 14 35.285997804   7.58 7.03     F9V 43 0
14 HD 145518 PM* 16 12 02.4536629920 -18 13 57.439412148   8.02 7.41     G0.5V 54 0
15 HD 146070 PM* 16 15 19.0934107848 -27 12 36.940048488   8.15 7.54     G1V 59 0
16 NAME LHB X 16 42.0 +02 19           ~ 414 0
17 HD 151192 PM* 16 46 34.3036420224 -17 35 42.881509536   8.91 8.23     G5V 47 0
18 HD 151504 PM* 16 48 32.2377307061 -19 17 15.964497355   8.87 8.09     G9IV-V 103 0
19 * eps Sco PM* 16 50 09.8108127 -34 17 35.633735 4.61 3.45 2.29 1.43 0.83 K1III 228 0
20 HD 153631 SB* 17 01 10.7567400948 -13 34 01.607438699   7.74 7.12     G0V 111 0
21 * eps02 Ara ** 17 03 08.7535948608 -53 14 12.969631572   5.750 5.278     F5VFe+0.5 97 0
22 * eta Oph ** 17 10 22.68689 -15 43 29.6639 2.56 2.47 2.42 2.39 2.38 A2IV-V 271 0
23 HD 156384 ** 17 18 57.16483 -34 59 23.1416 7.80 6.93 5.89 4.97 4.38 K3V+K5V 179 0
24 HD 157172 PM* 17 22 34.5658137312 -19 36 58.252609224   8.637 7.86 7.60 8.58 G8.5V 105 1
25 * d Oph PM* 17 27 21.2756332194 -29 52 01.325368180   4.672 4.269     F5III-IV 114 0
26 * alf Oph ** 17 34 56.06945 +12 33 36.1346 2.32 2.22 2.07 1.93 1.85 A5IVnn 495 0
27 * tet Sco * 17 37 19.12985 -42 59 52.1808   2.29 1.85     F1III 133 0
28 * 58 Oph PM* 17 43 25.7935382141 -21 40 59.498912759   5.313 4.861     F5V 160 0
29 * mu. Ara PM* 17 44 08.7031414872 -51 50 02.591603160   5.85 5.15     G3IV-V 578 2
30 * iot01 Sco s*y 17 47 35.0794702956 -40 07 37.190504381   3.492 2.992     F2Ia 122 0
31 HD 162521 PM* 17 56 24.2937328684 -65 43 18.255605671   6.81 6.36     F5V 55 0
32 * zet Ser PM* 18 00 29.0100539320 -03 41 24.977568563   4.982 4.616     F2V 203 0
33 HD 164651 PM* 18 02 17.8824112512 +00 06 15.088856868       7.2   G8V 56 0
34 * gam02 Sgr PM* 18 05 48.4880988 -30 25 26.723458 4.77 4.00 2.99 2.26 1.75 K0+III 158 0
35 CD-43 12272A PM* 18 06 49.8929258688 -43 25 30.800909676   5.84 5.62     A6V 74 0
36 * iot Pav SB* 18 10 26.1537006792 -62 00 07.992182016   6.07 5.49     G0V 134 0
37 HD 166916 * 18 12 39.7355002488 +04 11 59.398267056   9.80 9.63     A0V 7 0
38 HD 167425 PM* 18 19 40.1306187936 -63 53 11.622031944   6.88 6.25     F9.5V 74 0
39 * eta Ser PM* 18 21 18.6004923875 -02 53 55.780691633 4.84 4.19 3.25 2.55 2.05 K0III-IV 390 0
40 * eps Sgr PM* 18 24 10.31840 -34 23 04.6193   1.82 1.81     B9IVp_lB? 221 1
41 HD 169586 SB* 18 26 40.7864128848 -30 23 35.869329420   7.29 6.75     G0V 55 0
42 * tet Pav PM* 18 48 37.9048429296 -65 04 39.648145224   5.955 5.701     A8V 41 0
43 * 30 Sgr * 18 50 50.4909833856 -22 09 43.882389216   6.99 6.61     F2IV 53 0
44 * zet Sgr ** 19 02 36.73024 -29 52 48.2279   2.69 2.59     A2.5Va 181 0
45 * gam CrA A PM* 19 06 25.2146839530 -37 03 47.792348952   5.07 4.53     F8V 85 0
46 HD 177389 PM* 19 09 52.8681101376 -68 25 28.018058124   6.205 5.305     K0IV 47 0
47 HD 180409 PM* 19 16 52.2134354880 -10 58 18.396560460   7.50 6.92     F9V 78 0
48 * f Aql SB* 19 20 32.9062014840 -05 24 56.764910088   5.927 4.990     G8/K0IV 135 0
49 HD 181240 ** 19 20 38.1481323072 -22 24 09.166534380   5.851 5.579     A8III 46 0
50 HD 183143 s*b 19 27 26.5636061496 +18 17 45.193019136 8.25 8.08 6.86 5.74 4.79 B7Ia+ 464 0
51 * 42 Aql PM* 19 37 47.3178819696 -04 38 51.505017792   6.07 5.68     F5Vm 84 0
52 * alf Aql dS* 19 50 46.99855 +08 52 05.9563 1.07 0.98 0.76 0.62 0.49 A7Vn 919 1
53 * iot Sgr PM* 19 55 15.6947540258 -41 52 05.896040754 6.11 5.21 4.13     K0II/III 93 0
54 HD 191408 PM* 20 11 11.9387690214 -36 06 04.351725607   5.44 5.32     K2.5V 294 1
55 HD 192310 PM* 20 15 17.3913760474 -27 01 58.711625384   6.63 5.723 5.98 8.74 K2+V 359 1
56 * alf02 Cap PM* 20 18 03.2555957142 -12 32 41.467632703 5.20 4.51 3.58 2.91 2.42 G9III 181 0
57 HD 194640 PM* 20 27 44.2430551737 -30 52 04.244023567   7.35 6.62     G8V 124 0
58 * eta Ind dS* 20 44 02.3339803529 -51 55 15.493271117   4.767 4.495     A9IV 93 0
59 * psi Cap PM* 20 46 05.7329952443 -25 16 15.233491015   4.538 4.122     F5V 230 0
60 HD 199288 PM* 20 57 40.0687221764 -44 07 45.733001992   7.11 6.52     G2VFe-1.0 209 0

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