A catalogue of narrowband CCD images of 100 southern and 1 northern Planetary Nebulae is presented. The data are images taken in the light of the Hα , Hβ ,...
An atlas of optical continuum and line emission from low-mass X-ray binaries
We have obtained broad-band optical spectra of a sample of 15 low-mass X-ray binaries (LMXBs) in the range 4000-9000A and fitted them with combinations of...
An attempt to compare the differential rotation of the Ca/plus/-network with that of the photospheric plasma
Results of almost simultaneous observations of the differential rotation of the Ca(plus) chromosphere and the photospheric plasma are reported. The observations...
An attempt to identify low L - low N solar acoustic modes
The low l solar acoustic spectrum has been measured with great accuracy for intermediate radial order modes, n = 11-34 (Jimenez et al., 1986; Grec et al., 1983...
An automated system to classify stellar spectra - I
Analyses of stellar spectra often begin with the determination of a number of parameters that define a model atmosphere. This work presents a prototype for an...
An automatic procedure for a determination of the effective temperature and gravity - Application to 100 O-type stars
We have developed an automatic procedure to determine Teff and log g from the comparison of observational data with their theoretical values. After a...
An early-time infrared and optical study of the Type Ia Supernova 1998bu in M96
We present first-season infrared (IR) and optical photometry and spectroscopy of the Type Ia Supernova 1998bu in M96. We also report optical polarimetry of this...
An early-time infrared and optical study of the Type IA supernovae SN 1994D and 1991T
We present early-time infrared (IR) and optical spectroscopy, and optical photometry, of the Type Ia supernova 1994D. These observations provide the most...
An Earth-mass planet in a time of COVID-19: KMT-2020-BLG-0414Lb
We report the discovery of KMT-2020-BLG-0414Lb, with a planet-to-host mass ratio q 2 = 0.9-1.2 × 10 -5 = 3-4 ⊕ at 1σ, which is the lowest mass-ratio...