Details

Autor(en) / Beteiligte

• Wisniewski, J P
• Chojnowski, S D
• Davenport, J R A
• Bartz, J
• Pepper, J
• Whelan, D G
• Eikenberry, S S
• Lomax, J R
• Majewski, S R
• Richardson, N D
• Skrutskie, M

Titel

CHARACTERIZING THE RIGIDLY ROTATING MAGNETOSPHERE STARS HD 345439 AND HD 23478

Ist Teil von

• Astrophysical journal. Letters, 2015-10, Vol.811 (2), p.1-7

Ort / Verlag

United States

Erscheinungsjahr

2015

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• The SDSS III APOGEE survey recently identified two new a Ori E type candidates, HD 345439 and HD 23478, which are a rare subset of rapidly rotating massive stars whose large (kGauss) magnetic fields confine circumstellar material around these systems. Our analysis of multi-epoch photometric observations of HD 345439 from the Kilodegree Extremely Little Telescope, Wide Angle Search for Planets, and ASAS surveys reveals the presence of a ~0.7701 day period in each data set, suggesting the system is among the faster known [sigma] Ori E analogs. We also see clear evidence that the strength of H[alpha], HI Brackett series lines, and He I lines also vary on a ~0.7701 day period from our analysis of multi-epoch, multi-wavelength spectroscopic monitoring of the system from the APO 3.5 m telescope. We trace the evolution of select emission line profiles in the system, and observe coherent line profile variability in both optical and infrared H I lines, as expected for rigidly rotating magnetosphere stars. We also analyze the evolution of the H I Br-11 line strength and line profile in multi-epoch observations of HD 23478 from the SDSS-III APOGEE instrument. The observed periodic behavior is consistent with that recently reported by Sikora and collaborators in optical spectra.