14 research outputs found
Phase Dependent Spectroscopy of Mira Variable Stars
Spectroscopic measurements of Mira variable stars, as a function of phase, probe the stellar atmospheres and underlying pulsation mechanisms. For example, measuring variations in TiO, VO, and ZrO with phase can be used to help determine whether these molecular species are produced in an extended region above the layers where Balmer line emission occurs or below this shocked region. Using the same methods, the Balmer-line increment, where the strongest Balmer line at phase zero is H-delta and not H-alpha can be measured and explanations tested, along with another peculiarity, the absence of the H-epsilon line in the spectra of Miras when other Balmer lines are strong. We present new spectra covering the spectral range from 6200 Angstroms to 9000 Angstroms of 20 Mira variables. A relationship between variations in the CaII IR triplet and H-alpha as a function of phase support the hypothesis that H-epsilon's observational characteristics result from an interaction of H-epsilon photons with the CaII H line. New periods and epochs of variability are also presented for each star
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Radiation Damage Mechanisms for Luminescence in Eu-doped GaN
Thin films of Eu-doped GaN are irradiated with 500 keV He{sup +} ions to understand radiation damage mechanisms and to quantify luminescence efficiency. Ion beam induced luminescence was monitored spectroscopically as function of fluence. Behavior observed is consistent with simultaneous creation of non-radiative defects and destruction of luminescent centers associated with the 4f-4f core-level transition in Eu{sup 3+}. This model contrasts with a previous description which takes into account only non-radiative defect generation in GaN:Eu. Based on light from a BaF{sub 2} scintillator standard, the luminescent energy generation efficiency of GaN:Eu films doped to {approx}3 x 10{sup 18} cm{sup -3} Eu is estimated to be {approx}0.1%
Infrared Light Curves of Mira Variable Stars from COBE DIRBE Data
We have used the COBE DIRBE database to derive near- and mid-infrared light
curves for a well-defined sample of 38 infrared-bright Mira variable stars, and
compared with optical data from the AAVSO. In general, the 3.5 micron and 4.9
micron DIRBE bandpasses provide the best S/N light curves, with S/N decreasing
with wavelength at longer wavelengths. At 25 microns, good light curves are
only available for ~10 percent of our stars, and at wavelengths >= 60 microns,
extracting high quality light curves is not possible. The amplitude of
variability is typically less in the near-infrared than in the optical, and
less in the mid-infrared than in the near-infrared, with decreasing amplitude
with increasing wavelength. On average, there are 0.20 +/- 0.01 magnitudes
variation at 1.25 microns and 0.14 +/- 0.01 magnitudes variation at 4.9 micron
for each magnitude variation in V. The observed amplitudes are consistent with
results of recent theoretical models of circumstellar dust shells around Mira
variables. For a few stars in our sample, we find clear evidence of time lags
between the optical and maxima of phase ~ 0.05 - 0.13, with no lags in the
minima. For three stars, mid-infrared maximum appears to occur slightly before
that in the near-infrared,but after optical maximum. We find three examples of
secondary maxima in the rising portions of the DIRBE light curves, all of which
have optical counterparts in the AAVSO data, supporting the hypothesis that
they are due to shocks rather than newly-formed dust layers. We find no
conclusive evidence for rapid (hours to days) variations in the infrared
brightnesses of these stars.Comment: 16 pages, Astronomical Journal, in press, to be publishe
Constraints on Metal Oxide and Metal Hydroxide Abundances in the Winds of AGB Stars: Potential Detection of FeO in R Dor
Using the Atacama Large Millimeter/submillimeter Array (ALMA), we observed the stellar wind of two oxygen-rich asymptotic giant branch stars, IK Tau and R Dor, between 335 and 362 GHz. One aim was to detect metal oxides and metal hydroxides (AlO, AlOH, FeO, MgO, and MgOH), some of which are thought to be direct precursors of dust nucleation and growth. We report on the potential first detection of FeO (v = 0, Ω = 4, J = 11–10) in R Dor (mass-loss rate M• ~ 1 × 10−7 M ⊙ yr‾¹). The presence of FeO in IK Tau (M• ~ 5 × 10‾⁶ M ⊙ yr‾¹) cannot be confirmed, due to a blend with ²⁹SiS, a molecule that is absent in R Dor. The detection of AlO in R Dor and of AlOH in IK Tau was reported earlier by Decin et al. All other metal oxides and hydroxides, as well as MgS, remain undetected. We derive a column density N(FeO) of 1.1 ± 0.9 × 10¹⁵ cm‾² in R Dor, or a fractional abundance [FeO/H] ~ 1.5 × 10‾⁸ accounting for non-local thermodynamic equilibrium effects. The derived fractional abundance [FeO/H] is a factor ~20 larger than conventional gas-phase chemical-kinetic predictions. This discrepancy may be partly accounted for by the role of vibrationally excited OH in oxidizing Fe, or it may be evidence for other currently unrecognized chemical pathways producing FeO. Assuming a constant fractional abundance w.r.t. H₂, the upper limits for the other metals are [MgO/H₂] < 5.5 × 10‾¹⁰ (R Dor) and <7 × 10‾¹¹ (IK Tau), [MgOH/H₂] < 9 × 10‾⁹ (R Dor) and <1 × 10‾⁹ (IK Tau), [CaO/H₂] < 2.5 × 10‾⁹ (R Dor) and <1 × 10‾¹⁰ (IK Tau), [CaOH/H₂] < 6.5 × 10‾⁹ (R Dor) and <9 × 10‾¹⁰ (IK Tau), and [MgS/H₂] < 4.5 × 10‾¹⁰ (R Dor) and <6 × 10‾¹¹ (IK Tau). The retrieved upper-limit abundances for these latter molecules are in accord with the chemical model predictions
Resolved 24.5 micron emission from massive young stellar objects
Massive young stellar objects (MYSO) are surrounded by massive dusty
envelopes. Our aim is to establish their density structure on scales of ~1000
AU, i.e. a factor 10 increase in angular resolution compared to similar studies
performed in the (sub)mm. We have obtained diffraction-limited (0.6") 24.5
micron images of 14 well-known massive star formation regions with
Subaru/COMICS. The images reveal the presence of discrete MYSO sources which
are resolved on arcsecond scales. For many sources, radiative transfer models
are capable of satisfactorily reproducing the observations. They are described
by density powerlaw distributions (n(r) ~ r^(-p)) with p = 1.0 +/-0.25. Such
distributions are shallower than those found on larger scales probed with
single-dish (sub)mm studies. Other sources have density laws that are
shallower/steeper than p = 1.0 and there is evidence that these MYSOs are
viewed near edge-on or near face-on, respectively. The images also reveal a
diffuse component tracing somewhat larger scale structures, particularly
visible in the regions S140, AFGL 2136, IRAS 20126+4104, Mon R2, and Cep A. We
thus find a flattening of the MYSO envelope density law going from ~10 000 AU
down to scales of ~1000 AU. We propose that this may be evidence of rotational
support of the envelope (abridged).Comment: 21 pages, accepted for A&
The
We present a survey of high dispersion UV and optical spectra
of Herbig Ae/Be (HAeBe) and related stars. We find accreting,
circumstellar gas over the velocity range +100 to +400 km
s-1, and absorption profiles similar to those seen toward
β Pic, in 36% of the 33 HAeBe stars with IUE data as well
as in 3 non-emission B stars. We also find evidence of accretion
in 7 HAeBe stars with optical data only. Line profile
variability appears ubiquitous. As a group, the stars with
accreting gas signatures have higher than the stars
with outflowing material, and tend to exhibit large amplitude
() optical light variations. All of the program stars
with polarimetric variations that are anti-correlated with the
optical light, previously interpreted as the signature of a dust
disk viewed close to equator-on, also show spectral signatures
of accreting gas. These data imply that accretion activity in
HAeBe stars is preferentially observed when the line of sight
transits the circumstellar dust disk. Our data imply that the
spectroscopic signatures of accreting circumstellar material
seen in β Pic are not unique to that object, but instead
are consistent with interpretation of β Pic as a
comparatively young A star with its associated circumstellar
disk