![]() ![]() In early May, the MEC Negotiating Committee exchanged Section 6 openers with management, marking another milestone in the negotiating history at FedEx. ![]() This agreement provides for a focused agenda, setting a 12-month goal to complete negotiations. From constant trip revisions, trip extensions, hotel isolation, close-contact protocols, personal protective equipment requirements, being sprayed with unknown chemicals, the threat of incarceration for COVID noncompliance in foreign countries, having to choose between rest and nutrition, and more, the pilots continued to deliver on FedEx’s “Purple Promise.” All of this contributed to an extraordinary backdrop as the FedEx Master Executive Council (MEC) prepared for Contract 2021 bargaining.įor the first time in this pilot group’s bargaining experience, a historic protocol agreement between the pilots and the company was reached. Pilots endured working conditions unlike any ever seen in FedEx’s history. Through their efforts, millions of vaccines and lifesaving medical equipment were transported around the world. Throughout the pandemic, the FedEx pilots helped keep the world economy afloat and commerce moving. It was hard to imagine in December 2020 that in the next 12 months, FedEx pilots would deliver lifesaving vaccines and medical equipment all over the globe under extraordinarily taxing circumstances, open Section 6 negotiations under a historic protocol agreement, conduct 31 bargaining days encompassing the limited contract sections opened except for compensation and duration, and come together in dramatic showings of unity. Unfortunately, the pandemic was far from over and 2021 brought its own set of challenges, but it also brought opportunities. We deduce mass-loss rates of Ṁ pAGB ≈ 10 -6– 10 -7 M ⊙ yr -1, which are significantly higher than the values adopted by stellar evolution models currently in use and would result in a transition from the asymptotic giant branch to the PN phase faster than hitherto assumed.FedEx Express pilots entered 2021 like the rest of the world-seeking to put the challenges of 2020 and the COVID-19 pandemic in the rearview mirror. We find temperatures T e ~ 6000–17 000 K, mean densities n e ~ 10 5–10 8 cm -3, radial density gradients n e ∝ r − α n with α n ~ 2–3.5, and motions with velocities of ~10–30 km s -1 in the ionized wind regions traced by these mm-wavelength observations. We present the results from non-LTE line and continuum radiative transfer models, which enables us to constrain the structure, kinematics, and physical conditions (electron temperature and density) of the ionized cores of our sample. In M 2-9, the mm-RRL emission appears to be tracing a recent mass outburst by one of the stars of the central binary system. In the case of MWC 922, we observe a drastic transition from single-peaked profiles at 3 mm (H39 α and H41 α) to double-peaked profiles at 1 mm (H31 α and H30 α), which is consistent with maser amplification of the highest frequency lines the observed line profiles are compatible with rotation and expansion of the ionized gas, probably arranged in a disk+wind system around a ~5–10 M ⊙ central mass. For CRL 618, the only pPN with previous published detections of H41 α, H35 α, and H30 α emission, we find significant changes in the line profiles indicating that current observations are probing regions of the ionized wind with larger expansion velocities and mass-loss rate than ~29 yr ago. We detected mm-RRLs in three objects: CRL 618, MWC 922, and M 2-9. These lines are excellent probes of the dense inner ( ≲150 au) and heavily obscured regions of these objects, where the yet unknown agents for PN-shaping originate. ![]() ![]() Observations of the H30 α, H31 α, H39 α, H41 α, H48 β, H49 β, H51 β, and H55 γ lines at ~1 and ~3 mm have been performed with the IRAM 30 m radio telescope. We report the results from a pilot search for radio recombination line (RRL) emission at millimeter wavelengths in a small sample of pre-planetary nebulae (pPNe) and young PNe (yPNe) with emerging central ionized regions. Villafranca del Castillo, 28691 Villanueva de la Cañada, Madrid, SpainĮ-mail: Instituto de Astronomía, Universidad Nacional Autónoma de México, Apartado Postal 70-264, 04510 México, CDMX, Mexicoģ Observatorio Astronómico Nacional (IGN), Alfonso XII No 3, 28014 Madrid, SpainĤ Observatorio Astronómico Nacional (IGN), Ap 112, 28803 Alcalá de Henares, Madrid, Spainĥ Centro de Astrobiología (CSIC-INTA), Ctra de Torrejón a Ajalvir, km 4, 28850 Torrejón de Ardoz, Madrid, Spain Martín-Pintado 5ġ Centro de Astrobiología (CSIC-INTA), ESAC, Camino Bajo del Castillo s/n, Urb.
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