RE 1816+541: a northern hemisphere analogue to the low-mass rapid rotator HK Aqr.

Jeffries, R.D.; James, D.J.; Bromage, G.E.

Abstract

Spectroscopic observations of the optical counterpart to the ROSAT Wide Field Camera source RE 1816 + 541 are presented. We find that the counterpart is a chromospherically active, rapidly rotating, dM1-2e star with a
sin
of 61 km s−1. No evidence for radial velocity variations is found, and we conclude that RE 1816 + 541 is an example of the rare class of single, rapidly rotating field stars, and that it is similar to the southern hemisphere object HK Aqr. Assuming a mainsequence radius, a rotation period of 12 sin
hours is predicted. In common with several other active, rapid rotators, RE 1816 + 541 has a radial velocity consistent with membership of the Local Association, a comoving group of young B stars and open clusters such as the Pleiades. On the basis of this and its rapid rotation, we suspect a similar youthful evolutionary status for RE 1816 + 541, making it a good candidate for studying angular momentum loss and extreme magnetic activity in young, low-mass stars.

Citation

Jeffries, R., James, D., & Bromage, G. (1994). RE 1816+541: a northern hemisphere analogue to the low-mass rapid rotator HK Aqr. Monthly Notices of the Royal Astronomical Society, 271(2), https://doi.org/10.1093/mnras/271.2.476

• Journal Article Type: Article
• Publication Date: 1994-11
• Deposit Date: Feb 8, 2024
• Journal: Monthly Notices of the Royal Astronomical Society
• Print ISSN: 0035-8711
• Publisher: Oxford University Press
• Peer Reviewed: Peer Reviewed
• Volume: 271
• Issue: 2
• DOI: https://doi.org/10.1093/mnras/271.2.476
• Publisher URL: https://academic.oup.com/mnras/article/271/2/476/993416