35 9 v 2 3 D ec 1 99 7 A SEARCH FOR SOLAR - LIKE OSCILLATIONS IN α Cen A

نویسندگان

  • T. R. BEDDING
  • S. FRANDSEN
چکیده

We have been using a new method to search for solar-like oscillations that involves measuring temperature changes via their effect on the equivalent widths of the Balmer hydrogen lines. We observed α Cen A over six nights in 1995 with the 3.9-metre Anglo-Australian Telescope and the Eu-ropean Southern Observatory's 3.6-metre telescope in Chile. Oscillations were not detected, with an upper limit only slightly higher than the expected signal.

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

ar X iv : a st ro - p h / 97 10 35 9 v 1 3 1 O ct 1 99 7 A SEARCH FOR SOLAR - LIKE OSCILLATIONS IN α Cen A

We have been using a new method to search for solar-like oscillations that involves measuring temperature changes via their effect on the equivalent widths of the Balmer hydrogen lines. We observed α Cen A over six nights in 1995 with the 3.9-metre Anglo-Australian Telescope and the European Southern Observatory's 3.6-metre telescope in Chile. Oscillations were not detected, with an upper limit...

متن کامل

ar X iv : a st ro - p h / 02 09 35 9 v 1 1 8 Se p 20 02 Oscillations in α Cen A observed with UCLES at the AAT

We report Doppler measurements of α Cen A from time-series spec-troscopy made with UCLES at the 3.9-m AAT. Wavelength calibration using an iodine absorption cell produced high-precision velocity measurements, whose power spectrum shows the clear signature of solar-like oscillations, confirming the detection reported by Bouchy & Carrier (2001). 1. Observations and Reductions We were awarded six ...

متن کامل

The Amplitude of Solar Oscillations Using Stellar Techniques

The amplitudes of solar-like oscillations depend on the excitation and damping, both of which are controlled by convection. Comparing observations with theory should therefore improve our understanding of the underlying physics. However, theoretical models invariably compute oscillation amplitudes relative to the Sun, and it is therefore vital to have a good calibration of the solar amplitude u...

متن کامل

P - mode observations on α Cen A ⋆

We have made a clear detection of p-mode oscillations in the nearest solar-like G2V star α Cen A with the CORALIE spectrograph on the 1.2-m Swiss telescope at the ESO La Silla Observatory. We report the 5 nights of observation on this star in May 2001 during which 1260 high precision radial velocity measurements were obtained. The power spectrum clearly shows several identifiable peaks between ...

متن کامل

ar X iv : h ep - p h / 99 10 24 6 v 2 7 O ct 1 99 9 UH - 511 - 941 - 99 September 1999 Neutrino Anomalies without Oscillations ∗

I review explanations for the three neutrino anomalies (solar, atmospheric and LSND) which go beyond the “conventional” neutrino oscillations induced by mass-mixing. Several of these require non-zero neutrino masses as well.

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 1997