The catalog contains 1595 photoelectric radial-velocity observations for 790 bright southern star... more The catalog contains 1595 photoelectric radial-velocity observations for 790 bright southern stars of spectral type F5 and later. One of the purposes of this project is to make a complete southern sky radial velocity coverage using the second CORAVEL photoelectric radial velocity scanner. The first CORAVEL operating at Observatoire de Haute-Provence was used to observe the stars in the Northern
ABSTRACT The Draco dSph galaxy was observed during five nights in March 2000 at the 2.5m Isaac Ne... more ABSTRACT The Draco dSph galaxy was observed during five nights in March 2000 at the 2.5m Isaac Newton Telescope (INT) on La Palma using the Wide Field Camera (WFC). (2 data files).
The Earthshine telescope project is a collaborative effort between Lund Observatory (LO) in Swede... more The Earthshine telescope project is a collaborative effort between Lund Observatory (LO) in Sweden and The Institute of Meteorology in Demark (DMI) with the purpose of constructing one or more robotic telescopes to record the albedo of the Earth over a long time. The objective is to measure long-term development of the global cloud coverage and reflectivity for climate modeling. A 1% change in the Earth's albedo will result in an average temperature change of 0.5 K of the Earth, calling for high precision of the albedo measurements. This poses strict demands on the telescope design, in particular with respect to suppression of straylight. The paper describes our proposed optical and mechanical design of the Earthshine telescope, and presents a preliminary straylight analysis of the design.
Title: Progress of the site testing for the ESO VLT. Authors: Ardeberg, A.; Lindgren, H.; Lundstr... more Title: Progress of the site testing for the ESO VLT. Authors: Ardeberg, A.; Lindgren, H.; Lundström, I.; Sarazin, M. Publication: Identification, optimization, and protection of optical telescope sites, p. 94 - 98. Publication Date: 00/1987. Origin: ARI. ARI Keywords: Site Testing. ...
Radial velocity measurements for 233 stars of spectral types FO and later in the direction of the... more Radial velocity measurements for 233 stars of spectral types FO and later in the direction of the Small Magellanic Cloud (SMC) and between the two Magellanic Clouds (33 considered as galactic stars) are presented. Comparison with previous spectrographic radial velocities for OBA supergiants in the SMC shows that these latter must be corrected by -3 km/sec to be in the IAU system. The surface distribution of supergiants shows a tendency for the radial velocities to cluster in groups of different values, of low (5 km/sec) dispersion and of typical size of the order of 0.8 kpc at the distance of the SMC. The global histogram of the radial velocity distribution does not show distinct peaks as clearly as for the OBA supergiants. The overall mean radial velocity is, after correction of solar motions, - 1 + or - 1 km/sec; dispersion (18 km/sec) is the same for OBA and FO to M-type supergiants. All these considerations confirm the probable existence of several stellar groups of different ra...
The Nordic Optical Telescope (NOT) is described with its image quality in passive mode. Details a... more The Nordic Optical Telescope (NOT) is described with its image quality in passive mode. Details are given for the active optical system. We present observations testing its potential. Effects of optical aberrations can be corrected as functions of altitude, using an open loop active system needing occasional checks only. Forced aberrations are applied. The agreement between calculated and observed data is excellent. This is confirmed comparing results obtained with the passive and active optical systems. with open loop active optics, images with 0.15-0.20 arc seconds FWHM are within reach compared to 0.30 arc seconds in passive mode.
This paper presents a catalog 3 of the mean radial velocities of 471 giant stars in the galactic ... more This paper presents a catalog 3 of the mean radial velocities of 471 giant stars in the galactic globular cluster ! Centauri, the large majority of which are con rmed as cluster members. The typical uncertainty in the mean velocities is less than 1 km s ?1 ; a variability indicator and notes on chemical peculiarities are provided. In extension of earlier dynamical analyses of ! Centauri, based on part of the data presented here , a companion paper rediscusses the subject, based on the full data set and a new theoretical approach, using nonparametric techniques.
This paper analyses the results of accurate photoelectric radial velocity observations of 169 sta... more This paper analyses the results of accurate photoelectric radial velocity observations of 169 stars in 47 Tucanae, situated between 2 and 30 core radii from the cluster centre. The observations are published separately (Mayor et al., 1983). Radial velocity variations of 2-5 km s-1 in stars brighter than mv= 12 (Mv<-1.2) are found to be due to pulsational instability onthe
The catalog contains 1595 photoelectric radial-velocity observations for 790 bright southern star... more The catalog contains 1595 photoelectric radial-velocity observations for 790 bright southern stars of spectral type F5 and later. One of the purposes of this project is to make a complete southern sky radial velocity coverage using the second CORAVEL photoelectric radial velocity scanner. The first CORAVEL operating at Observatoire de Haute-Provence was used to observe the stars in the Northern
ABSTRACT The Draco dSph galaxy was observed during five nights in March 2000 at the 2.5m Isaac Ne... more ABSTRACT The Draco dSph galaxy was observed during five nights in March 2000 at the 2.5m Isaac Newton Telescope (INT) on La Palma using the Wide Field Camera (WFC). (2 data files).
The Earthshine telescope project is a collaborative effort between Lund Observatory (LO) in Swede... more The Earthshine telescope project is a collaborative effort between Lund Observatory (LO) in Sweden and The Institute of Meteorology in Demark (DMI) with the purpose of constructing one or more robotic telescopes to record the albedo of the Earth over a long time. The objective is to measure long-term development of the global cloud coverage and reflectivity for climate modeling. A 1% change in the Earth's albedo will result in an average temperature change of 0.5 K of the Earth, calling for high precision of the albedo measurements. This poses strict demands on the telescope design, in particular with respect to suppression of straylight. The paper describes our proposed optical and mechanical design of the Earthshine telescope, and presents a preliminary straylight analysis of the design.
Title: Progress of the site testing for the ESO VLT. Authors: Ardeberg, A.; Lindgren, H.; Lundstr... more Title: Progress of the site testing for the ESO VLT. Authors: Ardeberg, A.; Lindgren, H.; Lundström, I.; Sarazin, M. Publication: Identification, optimization, and protection of optical telescope sites, p. 94 - 98. Publication Date: 00/1987. Origin: ARI. ARI Keywords: Site Testing. ...
Radial velocity measurements for 233 stars of spectral types FO and later in the direction of the... more Radial velocity measurements for 233 stars of spectral types FO and later in the direction of the Small Magellanic Cloud (SMC) and between the two Magellanic Clouds (33 considered as galactic stars) are presented. Comparison with previous spectrographic radial velocities for OBA supergiants in the SMC shows that these latter must be corrected by -3 km/sec to be in the IAU system. The surface distribution of supergiants shows a tendency for the radial velocities to cluster in groups of different values, of low (5 km/sec) dispersion and of typical size of the order of 0.8 kpc at the distance of the SMC. The global histogram of the radial velocity distribution does not show distinct peaks as clearly as for the OBA supergiants. The overall mean radial velocity is, after correction of solar motions, - 1 + or - 1 km/sec; dispersion (18 km/sec) is the same for OBA and FO to M-type supergiants. All these considerations confirm the probable existence of several stellar groups of different ra...
The Nordic Optical Telescope (NOT) is described with its image quality in passive mode. Details a... more The Nordic Optical Telescope (NOT) is described with its image quality in passive mode. Details are given for the active optical system. We present observations testing its potential. Effects of optical aberrations can be corrected as functions of altitude, using an open loop active system needing occasional checks only. Forced aberrations are applied. The agreement between calculated and observed data is excellent. This is confirmed comparing results obtained with the passive and active optical systems. with open loop active optics, images with 0.15-0.20 arc seconds FWHM are within reach compared to 0.30 arc seconds in passive mode.
This paper presents a catalog 3 of the mean radial velocities of 471 giant stars in the galactic ... more This paper presents a catalog 3 of the mean radial velocities of 471 giant stars in the galactic globular cluster ! Centauri, the large majority of which are con rmed as cluster members. The typical uncertainty in the mean velocities is less than 1 km s ?1 ; a variability indicator and notes on chemical peculiarities are provided. In extension of earlier dynamical analyses of ! Centauri, based on part of the data presented here , a companion paper rediscusses the subject, based on the full data set and a new theoretical approach, using nonparametric techniques.
This paper analyses the results of accurate photoelectric radial velocity observations of 169 sta... more This paper analyses the results of accurate photoelectric radial velocity observations of 169 stars in 47 Tucanae, situated between 2 and 30 core radii from the cluster centre. The observations are published separately (Mayor et al., 1983). Radial velocity variations of 2-5 km s-1 in stars brighter than mv= 12 (Mv<-1.2) are found to be due to pulsational instability onthe
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Papers by A. Ardeberg