The chromospheric emission of solar-type stars in the young open clusters IC 2391 and IC 2602
Article
Article Title | The chromospheric emission of solar-type stars in the young open clusters IC 2391 and IC 2602 |
---|---|
ERA Journal ID | 1074 |
Article Category | Article |
Authors | Marsden, S. C. (Author), Carter, B. D. (Author) and Donati, J.-F. (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 399 (2), pp. 888-905 |
Number of Pages | 18 |
Year | 2009 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1111/j.1365-2966.2009.15319.x |
Web Address (URL) | https://academic.oup.com/mnras/article/399/2/888/1062733 |
Abstract | In this paper we present chromospheric emission levels of the solar-type stars in the young open clusters IC 2391 and IC 2602. High-resolution spectroscopic data were obtained for over 50 F, G and K stars from these clusters over several observing campaigns using the University College London Echelle Spectrograph on the 3.9-m Anglo-Australian Telescope. Unlike older clusters, the majority (28/52) of the solar-type stars in the two clusters are rapid rotators (v sin i > 20 km s−1) with five of the stars being classified as ultra-rapid rotators (v sin i > 100 km s−1) . The emission levels in the calcium infrared triplet lines were then used as a measure of the chromospheric activity of the stars. When plotted against the Rossby number (NR), the star's chromospheric emission levels show a plateau in the emission for log(NR) ≲−1.1 indicating chromospheric saturation similar to the coronal saturation seen in previously observed X-ray emission from the same stars. However, unlike the coronal emission, the chromospheric emission of the stars shows little evidence of a reduction in emission (i.e. supersaturation) for the ultra-rapid rotators in the clusters. Thus we believe that coronal supersaturation is not the result of an overall decrease in magnetic dynamo efficiency for ultra-rapid rotators. |
Keywords | stars; activity; late-type; rotation; open clusters and associations; individual; IC 2391; IC 2602 |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
370109. Tropospheric and stratospheric physics | |
519999. Other physical sciences not elsewhere classified | |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2009 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Byline Affiliations | Department of Biological and Physical Sciences |
Institute for Research in Astrophysics and Planetology, France |
https://research.usq.edu.au/item/9z334/the-chromospheric-emission-of-solar-type-stars-in-the-young-open-clusters-ic-2391-and-ic-2602
Download files
1974
total views298
total downloads0
views this month1
downloads this month