VizieR Online Data Catalog: V838 Mon photometry and spectra (Liimets+, 2023)
Abstract
The bases of this paper are the data collected since 2009 with the 2.56m Nordic Optical Telescope1 (NOT) equipped with the cryogenically cooled Alhambra Faint Object Spectrograph and Camera2 (ALFOSC). Bessel UBVR filters and interference filter i (NOT ID no. 12) with a central wavelength of 797 nm and FWHM 157 nm were exploited. The Bessel filters are equivalent to the Johnson-Cousins UBVRC system.
Low-resolution long-slit spectra were regularly collected, with NOT and ALFOSC, on a total of 28 nights starting from 2009. The observations were typically carried out twice a year, occasionally more frequently. Full optical coverage was achieved with grism 4 and a slit width of mostly providing spectral dispersion of ~3Å/pix (R~600 at 6600Å). Typical exposure times were 400 seconds which provides a S/N between ~10 and ~100 over the usable spectral range (4500-9000Å). In this way, the saturation of the red part of the cool star spectrum was avoided. Additional medium-resolution spectra were acquired on 28 nights. These were taken around the Hα 6562.8Å line with grism 17 and a slit width of mostly 0.5". The spectra cover the range between 6330 and 6870Å and have a dispersion of ~0.26Å/pix (R~9000 at 6600Å). The exposure times usually varied between 500 and 1200s guaranteeing a S/N>=100. In addition, a spectrum from September 2007 with the similar set-up is used in this work for comparison purposes. All spectra obtained with NOT were observed with the slit at the parallactic angle. (4 data files).- Publication:
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VizieR Online Data Catalog
- Pub Date:
- November 2022
- Bibcode:
- 2022yCat..36700013L
- Keywords:
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- Novae;
- Photometry: UBVRI;
- Spectroscopy