2018MNRAS.475.1521M

Query : 2018MNRAS.475.1521M

2018MNRAS.475.1521M - Mon. Not. R. Astron. Soc., 475, 1521-1536 (2018/April-1)

First results from the LIFE project: discovery of two magnetic hot evolved stars.

MARTIN A.J., NEINER C., OKSALA M.E., WADE G.A., KESZTHELYI Z., FOSSATI L., MARCOLINO W., MATHIS S. and GEORGY C.

Abstract (from CDS):

We present the initial results of the Large Impact of magnetic Fields on the Evolution of hot stars (LIFE) project. The focus of this project is the search for magnetic fields in evolved OBA giants and supergiants with visual magnitudes between 4 and 8, with the aim to investigate how the magnetic fields observed in upper main-sequence (MS) stars evolve from the MS until the late post-MS stages. In this paper, we present spectropolarimetric observations of 15 stars observed using the ESPaDOnS instrument of the Canada-France-Hawaii Telescope. For each star, we have determined the fundamental parameters and have used stellar evolution models to calculate their mass, age, and radius. Using the least-squared deconvolution technique, we have produced averaged line profiles for each star. From these profiles, we have measured the longitudinal magnetic field strength and have calculated the detection probability. We report the detection of magnetic fields in two stars of our sample: a weak field of Bl = 1.0 ± 0.2 G is detected in the post-MS A5 star 19 Aur and a stronger field of Bl = -230 ± 10 G is detected in the MS/post-MS B8/9 star HR 3042.

Abstract Copyright: © 2017 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): techniques: polarimetric - techniques: spectroscopic - stars: early-type - stars: evolution - stars: magnetic field - supergiants

Simbad objects: 19

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Number of rows : 19
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 HD 10362 * 01 42 58.3202573904 +61 25 15.863948112   6.320 6.323     B7III 51 0
2 V* EK Eri BY* 04 20 38.6418121776 -06 14 45.577773096   7.036 6.154     K0III 134 0
3 * 19 Aur V* 05 20 00.9210992208 +33 57 28.994858280 5.72 5.30 5.03     A5II+ 113 0
4 * zet Ori A SB* 05 40 45.527143 -01 56 33.26036   1.79 1.90     O9.2IbvarNwk 680 0
5 HD 42035 * 06 08 47.0322587592 +08 40 09.959999952   6.48 6.55     B9II: 45 0
6 * 13 Mon sg* 06 32 54.2279021568 +07 19 58.690911432 4.30 4.50 4.50 4.40 4.36 A0Ib 208 1
7 * omi02 CMa s*b 07 03 01.4713413613 -23 49 59.858307121 2.14 2.94 3.02 3.01 3.10 B3Ia 336 0
8 * gam CMa * 07 03 45.4934693195 -15 37 59.833212992 3.52 4.00 4.12 4.13 4.23 B8II 193 0
9 V* PT Pup bC* 07 36 41.0352383592 -19 42 08.425020168 4.65 5.524 5.699     B2III 155 0
10 HD 63655 * 07 49 28.8070286496 -13 21 10.618950528   6.141 6.234     B8/9II 38 0
11 HD 64827 ** 07 54 02.2069894872 -41 42 10.523694744   6.736 6.829     B8II 16 0
12 * iot Car V* 09 17 05.4068572 -59 16 30.835305 2.60 2.44 2.26 2.02 1.82 A7Ib 166 0
13 * ups Car * 09 47 06.12170 -65 04 19.2267   3.25 2.99 4.92   A9 77 0
14 * eta Leo sg* 10 07 19.9523915176 +16 45 45.587968398 3.17 3.39 3.41 3.32 3.35 A0Ib 351 0
15 * 15 Sgr s*b 18 15 12.9063291264 -20 43 41.767600368 4.64 5.42 5.37 5.27 5.19 O9.7Iab 268 0
16 HD 186660 * 19 45 52.2334869192 -02 53 00.441074076 5.99 6.53 6.48     B2III/IV 62 0
17 HD 188209 s*b 19 51 59.0687638680 +47 01 38.419078944 4.61 5.55 5.63 5.54 5.64 O9.5Iab 322 0
18 HD 209419 * 22 01 50.5866647688 +52 52 56.100144360 5.14 5.658 5.776     B5III 71 0
19 HD 210221 Pu* 22 07 25.5851458248 +53 18 26.773650216 6.81 6.555 6.171     A3Ib 86 0

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