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Abstract
NASA’s K2 mission is observing tens of thousands of stars along the ecliptic, providing data suitable for large scale asteroseismic analyses to inform galactic archaeology studies. Its first campaign covered a field near the north galactic cap, a region never covered before by large asteroseismic-ensemble investigations, and
was therefore of particular interest for exploring this part of our Galaxy. Here we report the asteroseismic analysis of all stars selected by the K2 Galactic Archaeology Program during the mission’s “North Galactic Cap” campaign 1. Our consolidated analysis uses six independent methods to measure the global seismic properties, in particular the large frequency separation, and the frequency of maximum power. From the full target sample of 8630 stars we find about 1200 oscillating red giants, a number comparable with estimates from galactic synthesis modeling. Thus, as a valuable by-product we find roughly 7500 stars to be dwarfs, which provide a sample well suited for galactic exoplanet occurrence studies because they originate from our simple
and easily reproducible selection function. In addition, to facilitate the full potential of the data set for galactic archaeology we assess the detection completeness of our sample of oscillating red giants. We find the sample is at least near complete for stars with 40 . νmax/µHz . 270, and νmax,detect < 2.6 × 106· 2−Kp µHz. There is a detection bias against helium core burning stars with νmax ∼ 30 µHz, affecting the number of measurements of ∆ν and possibly also νmax. Although we can detect oscillations down to Kp = 15, our campaign 1 sample lacks enough faint giants to assess the detection completeness for stars fainter than Kp ∼ 14.5.
Original language | English |
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Article number | 83 |
Journal | The Astrophysical Journal |
Volume | 835 |
Issue number | 1 |
DOIs | |
Publication status | Published - 20 Jan 2017 |
Keywords
- stars
- fundamental parameters — stars
- oscillations — stars
- interiors — planetary systems
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Dive into the research topics of 'The K2 Galactic Archaeology Program Data Release 1: Asteroseismic results from Campaign 1'. Together they form a unique fingerprint.Projects
- 1 Finished
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Asteroseismology and Helioseismology at Birmingham and Queen Mary
Chaplin, B., Elsworth, Y. & Miglio, A.
SCIENCE & TECHNOLOGY FACILITIES COUNCIL
1/04/15 → 30/09/18
Project: Research Councils