2018A&A...610L...3P


Query : 2018A&A...610L...3P

2018A&A...610L...3P - Astronomy and Astrophysics, volume 610, L3-3 (2018/2-1)

Detection of magnetic field in the B2 star ρ Ophiuchi A with ESO FORS2.

PILLITTERI I., FOSSATI L., CASTRO RODRIGUEZ N., OSKINOVA L. and WOLK S.J.

Abstract (from CDS):

Circumstantial evidence suggests that magnetism and enhanced X-ray emission are likely correlated in early B-type stars: similar fractions of them (∼10%) are strong and hard X-ray sources and possess strong magnetic fields. It is also known that some B-type stars have spots on their surface. Yet up to now no X-ray activity associated with spots on early-type stars was detected. In this Letter we report the detection of a magnetic field on the B2V star ρ Oph A. Previously, we assessed that the X-ray activity of this star is associated with a surface spot, herewith we establish its magnetic origin. We analyze spectra of ρ Oph A obtained with the FORS2 spectrograph at ESO Very Large Telescope (VLT) at two epochs, and detect a longitudinal component of the magnetic field of the order of ∼500G in one of the datasets. The detection of the magnetic field only at one epoch can be explained by stellar rotation which is also invoked to explain observed periodic X-ray activity. From archival HARPS ESO VLT high resolution spectra we derived the fundamental stellar parameters of ρ Oph A and further constrained its age. We conclude that ρ Oph A provides strong evidence for the presence of active X-ray emitting regions on young magnetized early type stars.

Abstract Copyright: © ESO, 2018

Journal keyword(s): stars: activity - stars: early-type - stars: magnetic field - pulsars: individual: rho Ophiuchi A

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NGC 1624 OpC 04 40 36.0 +50 27 42     11.8     ~ 71 1
2 HD 47777 Y*O 06 40 42.2934096648 +09 39 21.310266708 6.95 7.79 7.93   7.721 B3V 105 0
3 NGC 2264 OpC 06 40 52 +09 52.6           ~ 1718 0
4 HD 47887 Y*O 06 41 09.5990050152 +09 27 57.538520712 6.01 6.96 7.14   7.40 B2III: 102 0
5 * rho Oph ** 16 25 35.11766 -23 26 49.8150 4.30 4.85 4.63 4.27 3.96 B2IV+B2V 632 0
6 * rho Oph A * 16 25 35.1185711280 -23 26 49.831640736 4.3 5.22 5.05     B1V 397 0

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2022.12.06-19:41:16

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