Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.arcetri.astro.it/irlab/luna/archive/table.pdf Дата изменения: Thu Jul 28 18:24:28 2005 Дата индексирования: Sat Dec 22 06:48:32 2007 Кодировка: Поисковые слова: южная атлантическая аномалия

The Arcetri Lunar Occultation Data Archive

Release July 13, 2000

A. Richichi


Introduction.
This document describes the contents of the Arcetri Lunar Occultation Data Archive. It is available in electronic format, and it has links or references to the following documents: table.doc table.xls tableweb.xls pub_lo.doc telcode.doc refdata.doc maint.doc This document The Archive Table, full format The Archive Table, for distribution List of publications Telescope and Instrument Codes Criteria for Quick Reference Data Archive update (compiler use only)

The Archive Table is an Excel spreadsheet with links to the documents above, as well as to the actual Data Archive. The Data Archive and some link functionalities might not be fully available for distribution. The Archive Table table.xls includes several worksheets. They are briefly described below, and a full explanation is provided separately in the remainder of this document. Table Stats AD Map Locations Coords Coords2 WEB Archive Main Summary Table Statistical summary, magnitude histograms, etc Sky distribution of the sources Directory root names (compiler use only) Coordinates for Catalog updates (compiler use only) Alternate format of Source Coordinates Reduced-format archive for WEB publishing


Part I: Main Table
Top N Sequential order in the table. This is a free index, which is updated when the table is sorted or regenerated. See also: Ser. Ser Serial order in the table. This is an index fixed at the time of release. See also: N, Date. Source Link to the directory which contains the source data. The name is chosen arbitrarily, although care has been taken to use the designation of the catalogue which is most relevant for the specific source (lowercase, stripped of +/­ and special symbols). Clicking on the link will open the directory. In case of repeated observations, the directory names are embedded as a combination of Source and #. See also: CrossIdentifications, #. # Repeated observations flag. A 0 (zero) in this field means that only one observation is archived. Numbers greater than zero indicate sources for which repeated observations are available, in which case 1 is the first one, 2 the second one and so forth. One disadvantage of these scheme is that the user has to search manually for the actual number of repeated observations and for the directories related to the same source. Date The UT date of the event. This is also the main indexing criterium. Events are ordered according to their UT time (disappearance or reappearance time is chosen according to the type of the event), however there is no explicit indication of this time in the Table, if not under a link in Pred. See also Ser, Pred. Tel Code to designate the telescope and instrument used. The codes are reported in the separate document telcode.doc. Pred Prediction circumstances for the event. When available, this is a link to the file prev.dat in the source directory. Typically, this is a file generated by ALOP. The format is described in the separate document prev.doc. Cross-Identifications A multi-column field (4 fields in the first release, but the number in the next versions may change). The choice of identifications is arbitrary, a rule of thumb 1-2 are from visual catalogues (usually SAO and HD when avai and 1-2 are from IR surveys (usually IRC and IRAS when available). In case of a or famous object, HR numbers or Flamsteed names may be used. actual but as lable), bright

Dia Aperture used for the observation, in arcseconds. This is the diaphragm diameter for photometers, and the side of the subarray for array detectors.


Fil Wavelength of observation, if given in the paper. This is listed in different ways, depending on the type of measurement: - one or two numbers, in which case it means (and ) in µm; - a filter type. The usual standard photometric names apply (for instance: V, K, N) a symbol, for special or narrow filters. Examples can be: CVF (Circular Variable Filter, i.e. a narrow bandwidth filter used in the near-IR), H, Br. Timing This field has two columns, the sampling time t and the integration time , both expressed in ms. For some instruments, such as non-integrating IR photometers, is not meaningful and is not given. Note that in some cases the instrument output might be filtered during acquisition, but there is no specific entry for this in the table. See also Gain. Gain Some instruments have specific gain settings, which should be accounted for during the data reduction. These are usually entered as a code. For TIRGO/FIRT, the codes are H=high gain, L=low gain. See also Timing. Diameter Angular diameter, if resolved. This is usually reported for stellar sources, and can be either a published or unpublished value. This entry has 3 columns, where the values are all expressed in milliarcseconds (mas). These are the the angular diameter, its error, and an upper limit estimate, respectively. The entries for the angular diameter and the upper limit should be mutually exclusive, and the error is not always given. Shell Marks the presence of a circumstellar shell, either as a flag ("Y", or "shell"), or with a characteristic size in mas. Binary are listed: In case the source is a binary or multiple star, the following entries For LO PA (see without specifi measurements, this below). In case of a specific rule. In contribution of the

sep: separation in mas, as reported in the reference. is often only the projected separation along the occultation multiplicity (triple and higher), only one entry is reported, general, the result listed is the one which constituted the corresponding reference. See also PA and Type.

PA: position angle in degrees. This can be the true position angle, or the angle of the projection in case of 1-D measurements such as is in general the case for LO. In case of a multiple star, only one entry is present and the same considerations apply as for sep. R: brightness ratio (brighter to fainter), at the observation wavelength as reported in lambda and/or in the corresponding reference. In case of a multiple star, only one entry is present and the same considerations apply as for sep.


Typ: The type of binary. At the time of the initial release of the catalogue, the codes used are: D (double), T (triple), Q (quadruple), M (multiple, i.e. triple or higher), ND (not detected, in case of a source reported as binary or multiple in the literature). A missing Typ entry implicitly indicates a double star. SNR The signal-to-noise ratio, i.e. flux (of the whole system in case of multiplicity) divided by the standard-deviation of the best fit. This is not always reported, expecially for older data. Comments Comments inserted by the catalogue compiler.

Coordinates Source coordinates. The five columns list right ascension, declination, proper motions and epoch, respectively. The proper motions values are set to zero when not available. The format of right ascension is hh.mmsss. The format of declination is (-)dd.mmssss. Proper motions are expressed in "/year. Quick Reference Data This field has several columns, whose number and nature can vary in future releases as needed on the basis of practical experience. A description is included in the separate document refdata.doc. Entries are compiled from different sources. In the most common case, they are extracted from the Simbad database. They can also include data from the corresponding reference, or from private unpublished data. See also Simbad , Phot, Spec, References. Simbad This is a link to the information on the specific source, as listed in the Simbad database. It can be a local file on disk (code Y), or a URL that allows to look up Simbad directly (code U). Both codes can be present. A code N means that no Simbad entry is available for the source. The choice to have both stored information and an active link allows for the maximum flexibility: D links are immediate, and should have most of the information always available with a click. U links provide always complete and updated information (expecially for what concerns literature references), but require Internet connection and can be slow. Phot Link to a private compilation of photometric data on the source. The data may be unpublished. See also Spec. Spec Same as Phot, for spectroscopic data.

Chart Link to a finding chart, if available. The chart is an image of Digital Sky Survey (DSS) in JPG format, covering 10'x10'. DSS-1 is used, but extensions to DSS-2 can be foreseen and therefore a code D1 is used. Future extensions might add the D2B and D2R codes (blue and red). See also: Simbad. References Publications of the Arcetri group which include the source under consideration. This is usually a code with a sequential number. For instance, RP5 means the fifth publication in Refereed Papers. For the sake of convenience, this is usually also


a link to the list of publications pub_lo.doc. In turn, this has a link to the corresponding publication in electronic format (available only in the local implemtentation of the archive).


Part II: Secondary Worksheets
Top

Stats This worksheet displays some summary statistics. Included are: histograms of available V and K magnitudes; histogram of sources according to the year of observation; summary of available data, type of results and publications. Top AD Map This worksheet displays a plot of the source positions in the sky, according to the coordinates computed in Coords2. No correction for precession is applied. Top
This worksheet is used to store the root names of the directories in the Data Archive. It is intended for internal management only. Top

Locations

Coords This worksheet is used to store the source coordinates in a format specific for ALOP catalog updates. It is intended for internal management only. Top Coords2 This worksheet is used to store the source coordinates in a general format which can be used to generate coordinates lists for proposals, for plotting the positions in AD Map, etc. Top WEB Archive This worksheet is used to store a reduced version of the Archive Table, that can be published on the WEB or distributed to interested persons. Top