Early studies of molecular gas in M33 used the CO J=1-0 transition to map out the total gas content in the inner kiloparsec of the galaxy and to study the properties of the giant molecular cloud population. In this review, I discuss recent detailed studies of individual molecular clouds in M33 in higher rotational transitions of CO, CO, and the fine structure line of atomic carbon. These data r...

We present deep V,I photometry of two 9.4 ′ × 9.4 ′ field in the outer regions of the M 33 galaxy. We obtain a robust detection of the luminosity of the Red Giant Branch Tip (I T RGB = 20.72 ± 0.08) from which we derived a new estimate of the distance modulus of M 33, (m − M) 0 = 24.64 ± 0.15, corresponding to a distance D = 847 ± 60 Kpc. By comparison of the color and magnitude of the observed...

In a geometric context, two objects are “visible” to each other if there is a line segment connecting them that does not cross any obstacles. Over 500 papers have been published on aspects of visibility in computational geometry in the last 40 years. The research can be broadly classified as primarily focused on combinatorial issues, or primarily focused on algorithms. We partition the combinat...

Bronchiolitis, a disease primarily of the first 2 years of life charac­ terized by signs and symptoms of obstructive airway disease, is caused most commonly by viruses. Approximately 2% to 3% of infants in the first 12 months of life are hospitalized with bron­ chiolitis, accounting for approximately 125,000 hospitalizations and 200 to 500 deaths annually in the United States. Data from the Cen...

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We present ground-based spectra of early-type star candidates in the Local Group galaxies M 33 and NGC 6822 taken at the 4.2 m William Herschel Telescope (La Palma, Spain). Photospheric parameters Teff and log g were derived by LTE modeling of the Balmer lines. When possible, mass-loss rates were calculated from the Hα profiles computing emission and scattering in the wind with the method of Sc...

We present high resolution large scale observations of the molecular and atomic gas in the Local Group Galaxy M33. The observations were carried out using the HEterodyne Receiver Array (HERA) at the 30m IRAM telescope in the CO(2–1) line achieving a resolution of 12×2.6 km s−1, enabling individual Giant Molecular Clouds (GMCs) to be resolved. The observed region is 650 square arcminutes mainly ...

Aims. Study the high-mass X-ray binary X-7 in M33 using broad-band optical data. Methods. We used recently published CFHT r ′ and i ′ data for variable stars in M33 to extract the light curve of the optical counterpart of X-7. We combined these data with DIRECT B and V measurements in order to search for an independent optical modulation with the X-ray periodicity. The periodic modulation is mo...

Aims. We study the exponential scale length of total radio emission, the spectral index distribution, and the linear radio polarization in the Scd galaxy M33. Methods. Observations were carried out using the 3.6 cm dual channel and the 6.2 cm four channel receivers of the 100–m Effelsberg telescope along with the L-band VLA D–array at 20 cm. Results. High spatial resolution and sensitivity in b...

We present non-LTE analyses of four M33 early B-supergiant stars and five Galactic counterparts. This is the first time that B supergiants beyond the Magellanic Clouds are analyzed by means of detailed Non-LTE techniques. Among the M33 stars, new spectroscopic observations of B38 (ob21–108) are presented and the object is classified as B1Ia. The classification of another M33 star, B133, is chan...