INFRARED STUDIES NETWORK A summary of infrared observations during the 1984/85 apparition of P/Giacobini-Zinner (G-Z), prepared by the Discipline Specialist Team listed in Table I, is contained in Table II. These observations were both a test run for Comet Halley by many of the observers, and of intrinsic scientific interest for this comet. Highlights of the observations included striking infrared images, low resolution spectroscopy, limited infrared polarimetry, and photometry. Although the IHW encouraged and assisted in planning the observations, and interceded with observatories on behalf of the projects, a formally organ- ized photometric monitoring program of G-Z was not carried out. Partly on the basis of experience gained from G-Z, such programs were later organized and successfully executed for Comet Halley at several observatories. The filter descriptions (Tables III-IV) were supplied by the observers. Most of the fil- ters were supplied by the same source (Optical Coating Laboratory, Inc., OCLI) and are similar to each other. Further details can be found in the references and will also be included in the Comet Halley Archive when it is published. Table I. Discipline Specialist Team of the Infrared Studies Network ________________________________________________________________________________ Team Member Affiliation Responsibility ________________________________________________________________________________ Roger F. Knacke Department of Earth & Space Sciences Discipline Specialist State University of New York Stony Brook, NY 11794 U.S.A. Therese Encrenaz Observatoire de Paris Discipline Specialist Section d'Astrophysique F-92195 Meudon France Brian McGuinness Department of Earth & Space Sciences Software Assistant State University of New York Mildred O'Dowd Department of Earth & Space Sciences Assistant State University of New York ________________________________________________________________________________ Several choices had to be made about what to include in the archive. Considerable portions of the infrared data or analyses appear in the published literature. In the case of small data sets like photometry, the material was included in the archive, with appropriate references, even if it also appears in the literature. On the other hand, the images, which were all published, were included in digital form in the archive, but were not prepared for the printed volumes. The archive is a unique resource for these kinds of data. We emphasize that the G-Z archive should be used in conjunction with the original literature sources by the investigators whenever possible. It contains all the published references known to us as of August 15, 1988. When we knew of the existence of observations that were not submitted for archiving (in fact, just one case), we created descriptive files and refer- ences reflecting our knowledge of the data. These may assist future searches. It appears that the present archive is an essentially complete compendium of infrared observations of Comet P/Giacobini-Zinner in the 1984/85 apparition. Infrared spectroscopy and imaging data are contained in the digital G-Z archive and, in many cases, in the published literature. These data are not reproduced in the printed archive which, in this instance, is a guide and index to the primary references. The Infrared Studies column headings for the printed archive are described in Table V. Table VI contains keyword descriptions for the digital archive. These are essentially similar to or identical with the definitions used by the other networks and comply with the FITS standards. The Infrared Studies Discipline Specialist Team members would like to thank the observers, observatory directors, support personnel, and many others who contributed to and supported the P/Giacobini-Zinner Watch. Table II. Infrared Studies Network Observing Summary ________________________________________________________________________________ Date UT Observer(s) Facility Type of Observation ________________________________________________________________________________ 1985 June 8 Veeder, G., Hanner, M. IRTF J,H,K,8.7,N,Q 9 Veeder, G., Hanner, M. IRTF N,Q 10 Veeder, G., Hanner, M. IRTF N,Q 25 Joyce, R., Echohawk, J. KPNO J,H,K 26 Joyce, R., Echohawk, J. KPNO N 27 Grasdalen, G. WIRO K image July 9 Johnson, T., et al. IRTF 8.7,N,Q 10 Campins, H. KPNO J,H,K,L 12 Veeder, G. et al. IRTF 8.7,N Aug. 4 Telesco, C., et al. WIRO 10.8 image 15 Grasdalen, G., Williams, T. WIRO H,K images 17 Hayward, T., Jaworowski, C. WIRO K images Green, S., Davies, J. UKIRT J,H,K,L,L'; J,K images 18 Green, S., Davies, J. UKIRT J,H,K,L,L'; J,H,K,L images 19 Green, S., Davies, J. UKIRT J,H,K,L' images 24 McDonnell, J., Zarnecki, J. UKIRT 1.4-2.5 spectrum; J,H,K,L, L',8.7,9.8,11.6,12.5,N,Q 25 McDonnell, J., Zarnecki, J. UKIRT J,H,K,L,L',M,8.7,9.8,11.6, 12.5,N,Q Tokunaga, A., Griep, D. IRTF J,H,K,L,M,N,Q 26 McDonnell, J., Zarnecki, J. UKIRT K polarimetry Tokunaga, A., Griep, D. IRTF M,7.8,8.7,9.8,10.3,11.6, 12.5,N,Q 31 Hayward, T. Wilton, C. WIRO N images Sept. 4 Tokunaga, A., Griep, D. IRTF 8.7,N,Q Joyce, R. KPNO J,H,K 5 Kaminski, C. et al. IRTF N,Q 6 Golish, W., Kaminski, C. IRTF 8.7,N,Q 11 Grasdalen, G. WIRO H,K images 12 Green, S., MacDonald, G. UKIRT J,H,K,L,L',M,8.7,9.8 Hanner, M. et al. IRTF M,8.7,N,Q 13 Hayward, T., Greenhouse, M. WIRO K,N images 14 Greenhouse, M., Hayward, T. WIRO 1.9-2.5 spectrum 17 Bregman, J. KAO 8-13 spectrum ________________________________________________________________________________ Table III. NASA IRTF Filters (cf. Tokunaga 1986; OCLI 1987) and UKIRT Filters ______________________________________________________ NASA IRTF UKIRT -------------------- -------------------- Filter Effective Bandpass Effective Bandpass Name Wavelength FWHMa Wavelength FWHMa [micron] [micron] [micron] [micron] ______________________________________________________ J 1.25 0.30 1.25 0.3 H 1.65 0.35 1.65 0.3 K 2.20 0.42 2.20 0.4 L 3.45 1.05 3.53 0.7 L1 .... .... 3.73 0.6 L' 3.80 0.67 .... ... M 4.80 0.57 4.76 0.6 7.8 0.7 ... ... 8.7 1.2 8.7 1.2 9.8 1.2 9.8 1.2 N 10.1 5.1 10.0 5.2 10.3 1.3 .... ... 11.6 1.3 11.6 1.3 12.5 1.2 12.5 1.2 Q 20.0 9.0 19.2 5.0 ______________________________________________________ a Full width at half maximum Table IV. KPNO Filters (cf. KPNO IR Instrument Observers Manual) and WIRO Filters (OCLI 1987) _________________________________________________________ KPNO WIRO -------------------- ----------------------- Filter Effective Bandpass Center Half Power Name Wavelength FWHM(a) Wavelength Points [micron] [micron] [micron] [micron] _________________________________________________________ J 1.23 0.23 1.25 1.1, 1.4 H 1.653 0.297 1.65 1.5, 1.8 K 2.22 0.41 2.20 2.0, 2.4 L 3.45 0.57 3.82 3.5, 4.15 M 4.64 0.34 4.70 4.4, 5.0 N 10.2 6.0(b) .... ......... _________________________________________________________ a Full width at half maximum b 7.81-13.8 microns. Table V. Infrared Studies Printed Archive Column Headings ________________________________________________________________________________ Column Description ________________________________________________________________________________ 1. IR PHOTOMETRY Date (UT) Date of the middle of the observation (in days and fraction of a day, UT) IRSN # Infrared studies number--a unique number for each observation Filter Filter, a letter or a number (wavelength in microns)--usually described in a table in the appendix and/or in a reference in the literature Mag Magnitude and its error ApDia Aperture diameter in arcsec ExpS Length of observation in seconds See Seeing in arcsec Wea Weather (Clr = clear, Haz = hazy, etc.) Airm Average airmass during observation ChpThr Chopping Throw distance (in arcsec) and direction Or Origin or position of center of aperture (CV = center of visible image, PS = point of peak signal, number = reference to ORIGIN comment) FT Filter table number System Observatory system code Observer(s) Name(s) of observer(s) Notes Notes 2. IR POLARIMETRY Polar Percent polarization and error Angle Polarization angle (in deg) and error 3. IR SPECTROSCOPY Resol Spectral resolution (percent or fraction) Range Wavelength range of spectrum in microns Origin Same as Or in IR Photometry 4. IR IMAGING Range Wavelength range of filter in microns Pixel Pixel size in arcsec ________________________________________________________________________________ Table VI. Keywords in the FITS headers(a) ________________________________________________________________________________ Keyword Description ________________________________________________________________________________ SIMPLE Does the file conform to FITS format? (T = yes, F = no). T for all IR G-Z data BITPIX Number of bits/pixel NAXIS Number of axes in array EXTEND Is file written in conformance with the (new) extension standard? (T = yes, F = no). T for all IR G-Z data OBJECT Name of object FILE-NUM File identification number DATE-OBS Date of middle of observation (UT) TIME-OBS Time of middle of observation (UT decimal days) DATE-REL Date when observation may be publicly released DISCIPLN IHW Discipline ('IR STUDIES') LONG-OBS East longitude of observatory (0-360 degrees) LAT-OBS Latitude of observatory (+ = North, - = South) SYSTEM Observing system code 2NNNXXYY, where 2 denotes the IR Studies Network, NNN the IAU observatory code, XX the telescope, and YY not used OBSERVER Observer(s) Name(s) SUBMITTER Submitter(s) Name(s) SPEC-EVT Special Event? (T = yes, F = no). F for all IR G-Z data DAT-FORM Describes form of data, 'STANDARD' or 'ASCII' for tables DAT-TYPE Type of data being submitted ('PHOTOMETRY','POLARIZATION', 'SPECTROSCOPY','IMAGE ','LINEAR IMAGE','IMAGE SUM', or 'FILTERTABLE') OBSVTORY Name of submitting observatory LOCATION Location of submitting observatory TELESCOP Telescope identification (size) INSTRUME Instrument used COMMENT Cols. 9-80 are a comment HISTORY Cols. 9-80 are a comment FILTER Type of filter used APERSIZE Entrance aperture size (arcsec) AIRM-AVG Average airmass of observation RANGE-SP Approximate spectral range (Angstrom) RESOL-SP Approximate spectral resolution APSIZE Original pixel size of detector/digitizer DIS-CODE Filter table number (in filter table files) BSCALE Scale factor used to convert tape pixel values to true values (true = tape * BSCALE + BZERO) BZERO Offset applied to true pixel values DATAMIN Min. data value in the file DATAMAX Max. data value in the file END End of FITS header ________________________________________________________________________________ a Table extension keywords are defined and formated in each file. REFERENCES OCLI (1987). Infrared Stock Filter Catalog 1987. Optical Coating Laboratory, Inc., Santa Rosa, California. Tokunaga, A.T. (1986). IRTF Photometry Manual. Institute for Astronomy, Uni- versity of Hawaii, Honolulu.