Investigation of magnetically sensitive FeH lines

Details Investigation of magnetically sensitive FeH lines Investigation of magnetically sensitive FeH lines

2010-11-29

arxiv.org/abs/1011.6190v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

8 pages, 4 figures, proceeding of the CoolStars XVI conference (Seattle 2010)

Scientific paper

M-type stars exhibit strong magnetic fields towards decreasing effective temperatures. The measurement of these fields is complicated due to missing indicators. Molecular FeH lines provide an excellent means to determine magnetic field strengths from the Zeeman broadening of magnetically sensitive lines. Our aim is the investigation of possible dependencies of the amount of sensitivity to magnetic fields from rotational quantum number, branch, and the projection of the total angular momentum onto the internuclear axis ({\Omega}). We also compare results from com-putations with those from observations. We use high resolution CRIRES spectra of the two M dwarfs GJ1002 (M5.5 inactive) and GJ1224 (M4.5 active). Individual lines are fitted by Gaussians and the obtained line depths and widths from the active and inactive star can be compared with each other. In this way, magnetically sensitive lines can be detected. For test purposes, we do the same with computed spectra of FeH. One with zero magnetic field and the other with a 2 kG magnetic field vector used in the disc integration (i.e. pure radial at the disc center). We found, in agreement with theory, that lines with high {\Omega} show strong sensitivity to magnetic fields. No obvious correlation with branch or J was found, which was also expected for lines formed in intermediate Hund's case. The computations agreed in general well with the observations, but in many cases the individual splitting of certain lines can be very different to observations.

Affiliated with

Also associated with

No associations

Rating

Investigation of magnetically sensitive FeH lines does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Investigation of magnetically sensitive FeH lines, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Investigation of magnetically sensitive FeH lines will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-220681