Diversity of supernovae Ia determined using equivalent widths of Si II 4000
نویسندگان
چکیده
منابع مشابه
Spectral Diversity of Type Ia Supernovae
We use published spectroscopic and photometric data for 8 Type Ia supernovae to construct a dispersion spectrum for this class of object, showing their diversity over the wavelength range 3700 Å to 7100 Å. We find that the B and V bands are the spectral regions with the least dispersion, while the U band below 4100Å is more diverse. Some spectral features such as the Si line at 6150Å are also h...
متن کاملCan Λ be determined from nearby Type Ia Supernovae ?
Type Ia Supernovae (SNe Ia) are the best standard candles known today. At high redshift (z ∼ 1) SNe Ia are used to determine the Cosmological Constant Λ with great success. However the most serious concern is raised by the possible luminosity evolution of the SNe Ia explosion itself, i.e., that their intrinsic luminosity might vary with the look-back time. It is unknown to which extent high-red...
متن کاملEvidence for Spectropolarimetric Diversity in Type Ia Supernovae
We present single-epoch, post-maximum spectropolarimetry of four Type Ia supernovae (SNe Ia) that span a range of spectral and photometric properties: SN 2002bf and SN 2004dt exhibit unusually high-velocity (HV) absorption lines. SN 1997dt is probably somewhat subluminous, and SN 2003du is slightly overluminous. We detect polarization modulations across strong lines in all four objects, demonst...
متن کاملMeasuring stellar oscillations using equivalent widths of absorption lines
Kjeldsen et al. (1995) have developed a new technique for measuring stellar oscillations and claimed a detection in the G subgiant η Boo. The technique involves monitoring temperature fluctuations in a star via their effect on the equivalent width of Balmer lines. In this paper we use synthetic stellar spectra to investigate the temperature dependence of the Balmer lines, Ca ii, Fe i, the Mg b ...
متن کاملType Ia Supernovae
Type Ia Supernovae are in many aspects still enigmatic objects. Their observational and theoretical exploration is in full swing, but we still have plenty to learn about these explosions. Recent years have already witnessed a bonanza of supernova observations. The increased samples from dedicated searches have allowed the statistical investigation of Type Ia Supernovae as a class. The observati...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2008
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:200810675