Photometry of Symbiotic and VV Cephei Stars in the Near Infrared (With a Note on MWC 56)

Abstract

The majority of symbiotic and VV Cephei stars have near infrared continua closely resembling those of late-type stars. Evidence for weak infrared excesses has been found in the three stars RY Set, W Cep, and U Lac. RX Pup and V1016 Cyg exhibit very prominent infrared excesses which are attributable to thermal radiation from circumstellar dust.The "Rep" star MWC 56, whose spectrum shows Fen and [Fen] emission lines in the blue, possesses the absorption lines of a G or K component in the red. No substantial infrared excess is present.

AMBER/VLTI and MIDI/VLTI spectro-interferometric observations of the B[e] supergiant CPD$-57\mathrm{^\circ}\,2874$

“…The 2MASS data obtained on 2000 January 18 (Cutri et al 2003) are very similar (J = 5.76, H = 4.96, K = 4.3 ± 0.3 mag). However, the near-IR fluxes from Swings & Allen (1972) are very different: K = 5.44, H − K = 0.33, K − L ∼ 0.7 mag. Also, Wackerling (1970) quotes m vis = 8.6 mag and m pg = 10.2 mag 1 .…”

A far-ultraviolet atlas of symbiotic stars observed with IUE. 1. The SWP range

“…RX Pup is a D-type symbiotic star similar to a slow nova (Swings & Allen 1972). Six of the nine ultraviolet observations of RX Pup taken between 1980-1986 are in Figure 5.…”

JHK photometry of symbiotic stars

“…have found AS 327 to be unusually bright. The K magnitudes of AX Per as given by Swings & Allen (1972) and Szkody (1977) suggest strong variability. Kenyon & Gallagher (1983) found no evidence for the variability of AX Per, but our observations in the K band show an Schild et al (1996) unusually faint data point.…”

“…Infrared studies of symbiotic stars began with the pioneering work of Swings & Allen (1972). Later, Webster & Allen (1975) classified them into two types -S and D. The S-type stars are those with stellar continua of red giants in the infrared; the D-types are those having an infrared excess due to dust.…”