Massey Spectrophotometric Standards

Updated on May 16, 2021, 2:28 pm

P. Massey led a group at KPNO to obtain observations of 25 stars with nearly featureless spectra to be used as standards at various spectroscopic resolutions.  These results were published in two papers: (1) Massey et al. (1988) and (2) Massey and Gronwall (1990).  The former paper covers wavelengths from 3200Å to 8100Å and the latter paper extends the wavelength coverage to 10200Å for 11 of the standard stars in the former paper.  Both papers present the AB magnitudes of the standards at 50Å intervals.  The AB magnitudes are converted to flux  using the formula:

AB Mag = -2.5 Log(F) - 48.59 where F is in units of erg cm-2 s-1 Hz-1 using the flux calibration of Vega by Hayes and Latham (1975).

Massey Spectrophotometric Standards1
Star RA2
(J2000)
DEC2
(J2000)
Type V3 B-V3 m5556 Plots4
PG 0205+134 02:08:03.5 +13:36:31 sdOB (14.73) (-0.05) 14.87 DSS Blue/DSS Red/Spectrum
PG 0216+032 02:19:19.0 +03:26:54 sdOC (14.56) (-0.25) 14.79 DSS Blue/DSS Red/Spectrum
PG 0310+149 03:13:37.0 +15:06:24 sdO (15.50) (-0.07) 15.63 DSS Blue/DSS Red/Spectrum
HZ 14 04:41:01.5 +10:59:41 dA ... ... 14.01 DSS Blue/DSS Red/Spectrum
G 191B2B 05:05:30.6 +52:49:56 dAwk 11.80 -0.32 11.85 DSS Blue/DSS Red/Spectrum
Hiltner 600 06:45:13.4 +02:08:14 B1V 10.45 +0.18 10.42 DSS Blue/DSS Red/Spectrum
PG 0823+546 08:26:50.4 +54:28:06 sdOC ... ... 14.36 DSS Blue/DSS Red/Spectrum
PG 0846+249 08:49:04.7 +24:45:16 DA1 ... ... 16.94 DSS Blue/DSS Red/Spectrum
PG 0934+554 09:38:19.9 +55:05:43 sdO 12.16 -0.26 ... DSS Blue/DSS Red/Spectrum
PG 0939+262 09:42:51.2 +26:00:58 DA1 (14.66) (-0.28) 14.89 DSS Blue/DSS Red/Spectrum
Feige 34 10:39:36.9 +43:06:11 sdO 11.23 -0.30 11.25 DSS Blue/DSS Red/Spectrum
PG 1121+145 11:24:15.9 +14:13:49 DA1 16.63 -0.22 16.97 DSS Blue/DSS Red/Spectrum
GD 140 11:37:05.3 +29:47:51 DA2 12.50 -0.06 12.50 DSS Blue/DSS Red/Spectrum
EG 81 11:37:26.8 +14:10:21 sdO 13.21 -0.26 13.30 DSS Blue/DSS Red/Spectrum
Feige 66 12:37:23.5 +25:04:01 sdO ... ... 10.54 DSS Blue/DSS Red/Spectrum
Feige 67 12:41:48.9 +17:30:58 sdO 11.82 -0.32 11.89 DSS Blue/DSS Red/Spectrum
HZ 44 13:23:35.5 +36:08:01 sdO 11.68 -0.29 11.74 DSS Blue/DSS Red/Spectrum
PG 1545+035 15:48:24.3 +03:22:54 sdOB ... ... 14.34 DSS Blue/DSS Red/Spectrum
PG 1708+602 17:09:15.9 +60:10:11 sdOC (13.70) (-0.25) 13.92 DSS Blue/DSS Red/Spectrum
HD 192281 20:12:33.2 +40:16:06 O5f 7.55 +0.38 7.44 DSS Blue/DSS Red/Spectrum
Cyg OB2 No.9 20:33:10.8 +41:15:08 O5If 10.80 1.93 10.70 DSS Blue/DSS Red/Spectrum
Wolf 1346 20:34:22.3 +25:03:53 DA 11.54 -0.07 11.59 DSS Blue/DSS Red/Spectrum
BD +28 4211 21:51:11.2 +28:51:53 sdOp 10.53 -0.34 10.56 DSS Blue/DSS Red/Spectrum
HD 217086 22:56:47.2 +62:43:38 O5 7.65 +0.63 7.49 DSS Blue/DSS Red/Spectrum
Feige 110 23:19:58.4 -05:09:56 sdO 11.50 -0.32 11.88 DSS Blue/DSS Red/Spectrum

1 The information is this table is adaped from Table 1 of Massey et al. (1988)
2 The J2000 coordinates of the standards were measured from the Digital Sky Survey images of the stars.
3 Values in parenthesis are the v and g - v indices of Green, Schmidt, and Liebert (1986), which roughly correspond to V and B - V.
4The finding charts were made using Digital Sky Survey data. The "blue" finding charts were made using the POSS-II J survey data obtained with the IIIaJ emulsion and a GG395 filter. The "red" finding charts were made using the POSS-II F survey data obtained with the IIIaF emulsion and an RG610 filter. The exceptions to this are the finding charts for Feige 110, which were made using the SERC-EJ and SERC-ER survey data respectively. The spectral plots were made using the ASCII text files from the IRAF NOAO 1-D Standards library "spec50cal".