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HD 4915 at the Beginning of Maunder Minimum of Activity
AbstractBased on the available photometric data spanning almost 8000 days (21.9 years) of observations of a bright G5 V dwarf, solar-type star...
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Instrumental methods for professional and amateur collaborations in planetary astronomy
Amateur contributions to professional publications have increased exponentially over the last decades in the field of planetary astronomy. Here we...
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Catalogue of Minor Planet Names and Discovery Circumstances
Discovered 1801 Jan. 1 by G. Piazzi at Palermo. (* MC 3, 604) Named after the Roman goddess of corn and harvests, daughter of Rhea {see planet (577)}... -
Search for and study of hot circumstellar dust envelopes
Long-term (1984–2008) JHKLM photometry for 254 objects is presented. The observations were carried out in the standard JHKLM photometric system using...
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Catalogue of Minor Planet Names and Discovery Circumstances
Title page of Giuseppe Piazzi’s book “On the discovery of the new planet CERES FERDINANDEA, the eighth of those known in our solar system”. The... -
Spectroscopic monitoring of V1357 Cyg = Cyg X-1 in 2002–2004
We discuss the results of optical spectroscopic monitoring of Cyg X-1 = HDE 226868/V1357 Cyg in 2002–2004. Our spectroscopy was carried out at the...
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Determinations of high-precision effective temperatures for giants based on spectroscopic criteria
Spectral lines with high and low excitation potentials respond differently to changes of the effective temperature ( T eff ), making the ratio of their...
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Chemical composition of 15 photometric analogues of the Sun
The results of a spectroscopic analysis of 15 stars that are photometric analogues of the Sun are reported. The effective temperatures and surface...
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How to use this directory
A search for information in the directory would normally begin with consultation of the three-level index located at the end the volume (yellow... -
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The light curve variations in AR Lacertae
The eclípsing binary AR Lac has been observed in two colours, B and V , in 1980 and 1981. The new times of minimal obtained during the observatons...
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The RS CVn Binaries and Binaries with Similar Properties
This paper will review reasonably thoroughly and comprehensively the many observational properties of the remarkable RS CVn-type binaries. In... -
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Photometry of the minima of TX Herculis
Three epochs of primary and four epochs of secondary minima of TX Her were determined from photoelectric observations made between 1968 and 1973. The...