Mg II chromospheric line asymmetries in HD2151
| Main Author: | Perez - Martinez, M. Isabel |
|---|---|
| Other Authors: | Feiden, Gregory |
| Format: | Proceeding Journal |
| Terbitan: |
, 2016
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/58877 |
Daftar Isi:
- HD 2151 is considered the distant future of the solar evolution, with an effective temperature of 5852 K and surface gravity of log g=3.9, it is classified as G2 IV. Here I present a brief analysis of the Mg II (h+k) chromospheric emission lines of HD 2151, from 126 stellar spectra taken from the International Ultraviolet Explorer database, recorded from 1978 to 1995. By means of a Lomb Scargle periodogram, an activity cycle of 11.05 years was obtained and two sub cycles of the order of 4 years. Also, the Mg II emission line bisectors were calculated, showing not only long term variability, but also showing variations within the same day of observations. On the other hand, it was observed that the h line was stronger than the k, in agreement with previous works. Concerning the Mg II K line bisector, it is worth noting that the largest dispersion value was observed at the maximum Mg II emission flux, and a variability cycle of 200 days was obtained.